How Resource Accounting Works | Stocks, Flows, Depletion & Renewal

Series: How Resources Work
Canonical Parent: How Resources Work
Previous: How Resource Depletion Works

The Root Definition

Resource accounting is the disciplined process of identifying, measuring, classifying and reconciling the resources a system owns, controls, can access, consumes, renews, degrades, owes and must replace in order to understand its real capacity now and in the future.

Most systems know less about their resources than they think.

A company can know its cash balance and still not know how much experienced staff capacity it is quietly consuming. A city can know how many kilometres of road it owns and still not know how much useful road life remains. A school can know how many teachers it employs and still not know how much specialist teaching capability is actually available. A family can know its monthly income and still have no clear picture of how much time, health, attention and emergency resilience it is drawing down.

Resource accounting exists because counting what is visible is not the same as understanding what a system can really do.

What exists, what is usable, what is accessible, what is being consumed and what must be renewed are different numbers.

Good resource accounting makes those differences visible.

This Is Broader Than Financial Accounting

Formal financial accounting has its own rules, standards, statements and professional disciplines. This article is not a substitute for them.

Resource accounting asks a broader systems question:

What resources make this system capable, what is happening to those resources, and what future obligations are being created by present activity?

Money belongs inside that picture, but so do time, energy, inventory, infrastructure, land, water, information, expertise, trust, permissions, storage, maintenance capacity and other resources that may never appear neatly on a conventional balance sheet.

Why Resource Accounting Matters

Systems fail surprisingly often while their headline numbers still look acceptable.

A machine fleet keeps producing while maintenance backlogs rise.
A business keeps growing while cash reserves fall and staff exhaustion increases.
A school keeps completing the syllabus while prerequisite gaps accumulate.
A city keeps expanding while replacement liabilities for old infrastructure grow.
A database keeps getting larger while source quality and freshness fall.
A household maintains spending by consuming savings.

In each case, current output is being supported by a resource base whose condition is changing.

Resource accounting reveals whether present performance is being funded by healthy, renewable capability or by hidden drawdown.

The Six Fundamental Questions

What do we have?
What can we actually use?
What is flowing in and out?
What is degrading or being depleted?
What is being renewed or replaced?
What future obligation is accumulating because of what we are doing today?

Almost every mature resource-accounting system is some elaboration of these questions.

The Resource Ledger

A ledger is a structured record of state and change.

A resource ledger does not need to resemble a financial ledger exactly. Its purpose is to maintain a trustworthy account of the resource through time.

At minimum, a resource ledger should be able to record:

resource identity;
owner or custodian;
location;
quantity;
quality or condition;
access status;
inflows;
outflows;
losses;
renewal or replacement;
restrictions;
dependencies;
future obligations;
last verification date.

The more critical the resource, the more important it becomes to know not merely that it exists but whether the representation of it is current and true.

Stock, Flow and State

Three ideas form the core grammar of resource accounting.

Stock: how much resource exists at a moment in time.
Flow: how much resource enters, leaves, is created, consumed or transferred during a period.
State: the condition, quality, accessibility and readiness of the resource.

A fuel tank can have a stock of 10,000 litres. Deliveries and use are flows. Contamination, temperature and accessibility are aspects of state.

A school can have a stock of teachers. Hiring and resignations are flows. Experience, workload, subject competence and availability are aspects of state.

A data repository can contain millions of records. New records and deletions are flows. freshness, accuracy, provenance and permissions are aspects of state.

Counting stock without state creates false precision.

The Basic Resource Equation

For many resources, the simplest useful model is:

Ending Stock = Starting Stock + Additions + Renewal − Use − Losses − Retirements

The exact categories differ by domain, but the logic is powerful.

It forces the system to explain why the resource changed.

If a workforce shrank, did people resign, retire, become unavailable or get reassigned? If a water stock declined, did demand rise, inflows fall or leakage increase? If data quality weakened, did source quality fall, validation fail or records become stale?

Accounting turns “something seems lower” into an inspectable explanation.

Nominal Quantity and Usable Quantity

A central resource-accounting mistake is to assume every recorded unit is equally usable.

One hundred machines may include ten awaiting repair. One thousand litres of water may include a portion unsuitable for drinking. Fifty staff may include people unavailable to the project. Ten thousand documents may include obsolete versions.

A useful distinction is:

Nominal Stock ≠ Usable Stock ≠ Accessible Stock ≠ Deployable Stock

Resource accounting becomes much more honest when these categories are separated.

Quality-Adjusted Accounting

Quality-adjusted accounting recognises that units with different quality states do not create the same capability.

For some resources, quality can be represented through grades or bands. For others, condition scores, reliability levels or confidence ratings are more useful.

The principle is developed in How Resource Quality Works.

The accounting lesson is simple:

Count capability, not merely units.

Access-Adjusted Accounting

A resource can exist and still be inaccessible.

It may be in the wrong place, behind the wrong permission, priced beyond reach, unavailable at the needed time or invisible to the user who needs it.

Access-adjusted accounting asks how much of the recorded resource can actually be reached under real operating conditions.

The access layer is developed in How Resource Access Works.

For resource accounting, the consequence is important: inaccessible abundance can coexist with practical scarcity.

Resource Classes

A useful accounting system groups resources into classes with similar behaviour.

Natural: water, land, soil, forests, minerals, ecosystems.
Material: inventory, components, fuel, equipment, buildings.
Human: labour, expertise, health, attention, judgement, relationships.
Financial: cash, reserves, credit, claims, budgets.
Knowledge: data, documents, models, procedures, intellectual property.
Infrastructure: roads, grids, networks, platforms, institutions.
Temporal: time windows, deadlines, remaining life, recovery time.
Social and institutional: trust, permissions, legitimacy, governance capacity.

The purpose of classification is not to force unlike resources into one unit. It is to ensure every important resource family has an owner, a measurement logic and a renewal story.

Resources Do Not Need One Universal Unit

A common temptation is to convert everything into money.

Money is useful because it allows comparison, exchange and aggregation. But some important resource properties are lost when everything is compressed into a monetary value.

Ten years of specialist knowledge is not perfectly represented by salary cost. A wetland’s ecological function is not fully described by land price. A teacher’s trust with students is not captured by payroll. A secure data archive is not adequately described by storage cost.

Strong resource accounting can therefore use multiple units simultaneously.

Aggregate where aggregation helps; preserve distinct measurements where conversion would hide what matters.

Physical Accounts

Physical accounts measure resources in natural units.

litres of water;
tonnes of material;
hectares of land;
kilowatt-hours of energy;
machine hours;
storage capacity;
kilometres of infrastructure;
available seats or beds.

Physical accounts are valuable because they keep the underlying resource visible even when prices change.

Monetary Accounts

Monetary accounts express resources, costs or obligations in currency.

This makes comparison easier across unlike categories, but monetary value depends on assumptions about price, replacement cost, discounting and market availability.

A resource can become physically scarce before market prices reflect the full future consequence. Conversely, a resource can become cheaper because technology improves even while physical stocks decline.

Monetary and physical accounts should therefore inform each other rather than substitute for each other.

Capability Accounts

Capability accounts ask what the resource enables the system to do.

A hospital may count beds, but the more meaningful capability measure may be staffed beds available for a particular level of care. A school may count teachers, but capability may depend on subject expertise, timetable availability and class load. A logistics system may count vehicles, but usable transport capability depends on drivers, fuel, maintenance and route access.

Capability accounting prevents an inventory from masquerading as an operating system.

Resource Identity

A mature accounting system gives important resources stable identities.

An identity allows the system to answer:

what is this resource?
which version is it?
where did it come from?
who is responsible for it?
what state is it in?
what changed since the last observation?

Without stable identity, records fragment. The same resource is counted twice, old versions remain active, ownership becomes ambiguous or losses become difficult to reconcile.

The Double-Count Problem

Resource systems frequently double-count capability.

A shared specialist may be allocated fully to two projects. A backup inventory may be counted as available for several emergencies simultaneously. The same dataset may appear under several copies. One budget may be committed to multiple intentions before expenditure occurs.

Double-counting creates imaginary capacity.

A resource promised twice is not twice the resource.

Commitments

A resource can be present but already committed.

Cash may sit in an account but be reserved for payroll. staff may appear available but be committed to existing projects. land may be undeveloped but designated for future infrastructure.

Resource accounting should therefore separate:

gross stock;
committed stock;
restricted stock;
free stock;
contingency stock.

This is the difference between what exists and what remains available for a new decision.

Restrictions

Some resources can only be used under specific conditions.

Restrictions may be legal, contractual, technical, ethical, geographical or operational.

A grant may fund only one purpose. a dataset may have privacy restrictions. a machine may require certified operators. an emergency reserve may have a release rule.

Restricted resources belong on the ledger, but should not be treated as freely deployable capability.

Resource Custody

Ownership and custody can differ.

A warehouse may hold goods owned by a customer. a cloud provider may store data belonging to another organisation. a museum may hold objects on loan.

Resource accounting should distinguish legal ownership, physical custody, operational control and responsibility for maintenance.

Otherwise the same resource can disappear into gaps between organisations.

Reconciliation

Reconciliation compares the recorded resource state with another independent representation or with physical reality.

A warehouse counts stock. A finance team reconciles bank records. An IT team verifies backups. A school confirms enrolment and timetable allocations. An asset manager inspects infrastructure against the register.

Reconciliation is how the ledger remembers that it is a model of reality, not reality itself.

Representation Drift

Representation drift occurs when the recorded state and the real state slowly diverge.

stock is used but not recorded;
assets move location;
quality deteriorates without updating the record;
permissions change;
staff capability changes;
documents are superseded;
commitments are made informally.

Small mismatches accumulate until the ledger becomes an attractive fiction.

Frequent reconciliation protects decision quality.

Measurement Frequency

Not every resource needs to be measured continuously.

High-value, fast-changing or safety-critical resources may require frequent measurement. Slow-moving resources can be reviewed less often.

The correct frequency depends on:

rate of change;
cost of measurement;
consequence of error;
reversibility;
time needed to respond.

Measurement should be fast enough that the system can still act before the information becomes irrelevant.

Measurement Cost

Accounting itself consumes resources.

Counting inventory takes labour. sensors cost money. inspections take time. surveys consume attention. audit systems create administrative overhead.

The goal is not perfect measurement of everything.

The goal is sufficient measurement of what matters enough to change decisions.

Measure deeply where ignorance is expensive.

Materiality

Materiality asks whether a resource state or change is significant enough to affect a decision.

A minor mismatch in stationery stock may not justify expensive controls. A minor mismatch in a critical medication, bridge inspection record or security credential may matter enormously.

Materiality is therefore contextual.

The same numerical error can be trivial in one resource and dangerous in another.

Criticality

Criticality describes how much the wider system depends on a resource.

A low-cost part can be highly critical if its absence stops an entire production line. One experienced person can be highly critical if no replacement knows the system. One small database table can be critical if every transaction depends on it.

Resource accounts should therefore record criticality separately from monetary value.

Resource Dependencies

Resources rarely create capability alone.

A machine requires electricity, operators, maintenance and materials. A teacher requires time, students and curriculum. A server requires power, network access and software. A reserve requires release authority.

Resource accounting should therefore capture dependencies.

Otherwise a system can count every component separately while missing the fact that one missing complement makes the whole bundle unusable.

Bundles

A resource bundle is the minimum combination required to create a capability.

A hospital bed without staffing is not the same resource as a staffed bed. A classroom without a teacher is not instructional capacity. A vehicle without fuel, maintenance and driver availability is not transport capacity.

Bundle accounting is often more useful than counting isolated components.

Resource Conversion Accounting

Resources matter because they become something else.

Conversion accounting follows resources into outputs, outcomes and capability.

How much energy became useful work? How much teaching time became durable learning? How much capital became productive infrastructure? How much data became trustworthy decision support?

This connection is developed in How Resource Conversion Works.

For accounting, the key idea is that consumption should be linked to the capability created.

Input Accounting Is Not Enough

Systems often measure what they spend because spending is easier to observe than outcomes.

A school can count lesson hours. A government can count programme expenditure. A business can count marketing budget. A factory can count tonnes of material consumed.

But inputs do not prove capability.

A complete resource account therefore links input, process, output, outcome and future resource state.

Loss Accounts

Every resource system loses value somewhere.

material is scrapped;
energy becomes waste heat;
water leaks;
inventory expires;
attention is consumed by interruption;
time is lost waiting;
information is duplicated;
trust is damaged;
skills decay.

Loss accounting asks where resources disappear without creating proportional capability.

This makes waste visible as a balance-sheet problem, not merely a housekeeping problem.

Unexplained Loss

If a stock changed but recorded inflows and outflows do not explain the change, the system has unexplained loss.

The cause might be measurement error, theft, leakage, unrecorded use, corruption or a broken process.

Unexplained loss is valuable information because it reveals where the accounting model and the real system disagree.

Depletion Accounts

Depletion accounting records the reduction in future resource capability caused by present use, degradation or damage.

A mine loses remaining extractable material. A battery loses useful capacity. Infrastructure loses remaining service life. A workforce can lose sustainable capacity through chronic overload. A knowledge base can lose freshness.

The depletion mechanism is developed in How Resource Depletion Works.

The accounting principle is that current output should not hide the future capability consumed to produce it.

Renewal Accounts

Renewal accounting records how the system restores what use and time have consumed.

inventory replenishment;
maintenance;
repair;
replacement;
training;
rest;
ecological regeneration;
data refresh;
succession;
institutional learning.

The renewal mechanism is developed in How Resource Renewal Works.

A resource account is incomplete if it records depletion but has no account for restoration.

Replacement Accounts

Some resources cannot be renewed indefinitely and must eventually be replaced.

Machines wear out. buildings need major renewal. staff retire. software platforms become obsolete.

Replacement accounting estimates what resources will be required to preserve capability when the current asset, person, system or stock reaches the end of useful life.

This future need is a real obligation even if no cash has yet been spent.

The Replacement Liability

A replacement liability is the future resource requirement created because current capability depends on something that will not last forever.

A city with aging bridges has future engineering and capital requirements. A business dependent on one senior specialist has a succession requirement. A school relying on a small group of veteran teachers has a training and recruitment requirement.

The liability exists before the replacement event arrives.

Future replacement needs are present resource facts.

Maintenance Backlog

Maintenance backlog is accumulated work required to restore resources to the desired condition.

Backlog behaves like a liability because the work does not disappear when it is postponed.

In some systems, postponement makes the eventual work more expensive because deterioration continues.

A resource account should therefore distinguish:

current condition;
required condition;
maintenance needed to close the gap;
cost of continued deferral.

Resource Debt

Resource debt is future work or future resource demand created when the system obtains present output by under-renewing, overusing or degrading the resource base.

Technical debt is one example. maintenance debt is another. training debt, data-cleaning debt and ecological restoration debt follow the same architecture.

Debt is not automatically irrational. It becomes dangerous when it is invisible, unpriced or grows faster than the system’s ability to repay it.

Hidden Reserves

Systems often possess reserves that ordinary accounting does not show clearly.

employees can temporarily work longer hours;
equipment can sometimes run above normal utilisation;
families can use savings;
organisations can defer maintenance;
teachers can absorb additional preparation;
ecosystems can buffer some disturbance.

These reserves support resilience, but using them should be recorded conceptually as drawdown.

Otherwise the system mistakes emergency capacity for permanent capacity.

Hidden Liabilities

Hidden liabilities arise when current activity creates future obligations that are not visible in ordinary performance metrics.

deferred replacement;
staff burnout;
environmental restoration;
security vulnerabilities;
unsupported legacy software;
outdated teaching materials;
unfunded future maintenance;
knowledge concentrated in one person.

A system can therefore look efficient because it has pushed cost into the future.

The Resource Balance Sheet

A resource balance sheet is a conceptual snapshot of the resource base supporting the system.

It can include:

usable stocks;
reserve stocks;
condition and quality;
access constraints;
critical dependencies;
renewal capacity;
replacement obligations;
depletion debt;
unresolved losses;
future commitments.

The purpose is not necessarily to place all of these on one monetary statement.

The purpose is to give decision-makers a coherent picture of present capability and future fragility.

Resource Income Statement

If the balance sheet describes state, a resource income statement can describe change during a period.

resources acquired;
resources created;
resources consumed;
resources lost;
resources renewed;
resources transferred;
quality improvements;
quality degradation.

This reveals whether the resource base strengthened or weakened while the system produced its outputs.

Resource Cash Flow Analogy

Cash-flow thinking is useful because systems fail when timing is ignored.

A resource may be sufficient over a year but unavailable at the moment of need.

Resource-flow accounting therefore asks when inputs arrive and when outputs require them.

This is essential for electricity, water, inventory, staffing, classrooms, hospital beds and computing capacity.

Time Is an Accounting Dimension

The same quantity can have different value depending on timing.

A spare part after a machine has been down for three weeks is not equivalent to the same part on the shelf before failure. Teacher time after an examination is not equivalent to teacher time during preparation. Emergency water delivered after reserves are exhausted is not equivalent to water already stored.

Resource accounts therefore need lead time, availability windows and recovery time—not just amounts.

Location Is an Accounting Dimension

Resources are not fungible across space when transport or transfer is constrained.

A hospital bed in one region cannot serve a patient instantly in another. inventory in the wrong warehouse may not solve a local shortage. electricity may be abundant where transmission capacity is limited.

Location should therefore be part of the resource ledger whenever movement matters.

Resource Storage Accounting

Stored resources require accounts for quantity, condition, location, age, access and turnover.

A strategic reserve that exists but is expired is not a valid reserve. A backup that cannot be restored is not functional protection. A warehouse stock that cannot be located is not fully usable inventory.

The storage architecture is developed in How Resource Storage Works.

Accounting provides the representation that allows storage to be managed.

Resource Allocation Accounting

Allocation changes who can use a resource and what alternative uses are forgone.

A resource account should therefore show commitments and assignments, not only ownership.

The allocation architecture is developed in How Resource Allocation Works.

Accounting makes allocation visible. Allocation gives accounting practical consequences.

Scarcity Accounting

Scarcity is not simply low stock.

A resource becomes scarce when available capability is insufficient relative to competing claims.

Resource accounting therefore needs both supply and demand context.

One hundred units may be abundant when demand is fifty and scarce when demand is one thousand.

The scarcity relationship is developed in How Scarcity Works.

Bottleneck Accounting

The value of a resource is partly determined by whether it is the binding constraint.

An additional unit of a non-bottleneck resource may create little extra capability. An additional unit of the bottleneck resource can unlock the entire system.

Resource accounting should therefore record critical constraints, not merely total inventory.

The bottleneck mechanism is developed in How Resource Bottlenecks Work.

Resource Adequacy

Adequacy asks whether the available resource bundle is sufficient for the required task under realistic conditions.

Accounting provides the data required to answer that question.

A resource stock can be large in absolute terms but inadequate relative to peak demand, geographic distribution, quality requirements or contingency needs.

Reserves

Reserve accounting separates ordinary operating stock from resources deliberately held for uncertainty or crisis.

A reserve should have:

a defined purpose;
a target size or coverage level;
a release rule;
a custodian;
a condition check;
a replenishment rule.

Without these, “reserve” can become a vague label attached to ordinary stock.

Days of Cover

For consumable resources, raw stock is often less useful than the amount of time the stock can support expected use.

Days, weeks or months of cover combine stock with consumption rate.

This is useful for inventory, cash runway, fuel, food and other replenishable resources.

Coverage metrics convert static inventory into time-to-constraint.

Runway

Runway describes how long a resource stock can support the current operating pattern before reaching a critical threshold.

Cash runway is familiar, but the same idea applies to other resources.

inventory runway;
staffing runway;
water runway;
maintenance-spares runway;
context-window runway;
remaining-life runway.

Runway becomes especially useful when inflows may stop temporarily.

Capacity Accounts

Capacity accounting asks how much work a resource system can perform during a period.

It differs from stock accounting.

A warehouse can hold a large stock but have low dispatch capacity. A school can employ many teachers but have limited timetable capacity for a particular subject. A power system can possess significant generating assets but face limited transmission capacity.

Capacity is therefore a flow capability, not simply an inventory count.

Utilisation

Utilisation compares actual use with available capacity.

Low utilisation can indicate spare capacity, poor matching or unnecessary investment. Very high utilisation can improve efficiency but leave little room for variability, maintenance or failure.

Resource accounts should therefore distinguish designed capacity, practical capacity, committed capacity and spare capacity.

Spare Capacity

Spare capacity is often criticised as idle resource.

But some spare capacity performs a resilience function.

It absorbs demand surges, maintenance, failures and uncertainty.

Accounting should therefore distinguish wasteful idleness from deliberate resilience margin.

Resource Velocity

Velocity describes how quickly a resource moves through a system.

Inventory turnover, bed turnover, container movement and task completion are examples of flow velocity.

Higher velocity can reduce the stock required to support a given level of activity.

But excessive speed can reduce quality or resilience if buffers disappear.

Turnover

Turnover measures how frequently a stored resource is used and replaced during a period.

Fast turnover can indicate efficient use. Slow turnover may indicate strategic reserves, obsolete inventory or genuinely low-frequency need.

Turnover should therefore be interpreted with purpose.

Age Profiles

For long-lived resources, average age can hide important risk.

A fleet can have a moderate average age while a large cohort approaches retirement simultaneously.

Infrastructure, machines, software and workforce expertise often need age-profile accounting.

Cohort analysis reveals future renewal waves before they become crises.

Remaining Useful Life

Remaining useful life estimates how much longer a resource can continue performing acceptably before major renewal or replacement.

This metric is often more useful than chronological age.

Two machines of the same age can have different remaining life because their operating conditions and maintenance histories differ.

Resource accounting should therefore track condition where possible, not age alone.

Uncertainty

Resource accounts are models, not perfect mirrors.

Measurements contain uncertainty. future renewal rates are uncertain. quality estimates can be incomplete. demand forecasts can be wrong.

A mature account therefore records confidence, ranges or scenarios rather than pretending every number is exact.

A precise wrong number is not better than an honest range.

Confidence Levels

Confidence levels indicate how trustworthy a resource measurement is.

A recently inspected asset may have high-confidence condition data. A remote ecological estimate may have wider uncertainty. A team’s undocumented skill inventory may be approximate.

Decision-makers should know where the ledger is measured and where it is inferred.

Scenario Accounts

Some future resource obligations cannot be represented by one forecast.

A scenario account asks what the resource position becomes under several plausible futures.

high demand;
low demand;
slow renewal;
supplier loss;
price shock;
technology substitution;
faster degradation.

This reveals which resource positions are robust and which depend on one optimistic assumption.

Stress Accounts

Stress accounting asks what happens to resource balances under extreme but plausible conditions.

How quickly do reserves fall if inflow stops? Which resource becomes the bottleneck first? Which commitments cannot be honoured? What renewal work must be postponed?

Stress tests turn static accounts into resilience analysis.

Resource Provenance

Provenance records where a resource came from and what happened to it.

For physical goods, provenance can include supplier, batch, custody and processing history. For information, provenance can include author, source, date, evidence and modifications.

Provenance matters because some resource quality cannot be verified from the object alone.

The ledger therefore stores history as part of present trust.

Version Accounting

Changing resources need versions.

Software, policies, procedures, datasets and engineering drawings can all exist in several versions simultaneously.

Version accounting distinguishes current authority from historical preservation.

Without it, a system can possess the right resource but activate the wrong version.

Resource Freshness

Some resources lose usefulness because the world changes around them.

Prices, schedules, software, regulations, scientific knowledge and operational data can become stale.

Freshness accounting records the age of information relative to the rate at which the underlying reality changes.

Freshness is therefore not merely a timestamp. It is a relationship between update age and decision sensitivity.

Resource Obsolescence

A resource can remain intact while becoming obsolete.

Old software may no longer be supported. spare parts may no longer fit current equipment. teaching materials may no longer align with the curriculum. skills may no longer match the tools used by the industry.

Obsolescence is a loss of future usefulness and should be reflected in resource state.

The Resource Register

A resource register is a structured list of resources important enough to be governed explicitly.

Each entry can include:

identifier;
name;
resource class;
owner;
location;
quantity;
quality state;
access state;
criticality;
dependencies;
renewal method;
review date;
source of truth.

The register creates a shared map of what the system considers worth remembering.

Source of Truth

When several records describe the same resource, the system needs a canonical source of truth.

Otherwise departments maintain conflicting counts, old files remain authoritative and reconciliation becomes political.

A canonical record does not mean only one copy may exist. It means one defined location has authority for the current state.

Shadow Accounts

Shadow accounts appear when teams maintain unofficial spreadsheets, private notes or local databases because the formal system does not meet operational needs.

Shadow systems are not always irrational. They often reveal missing fields, slow workflows or poor interfaces.

But they create duplication and divergence.

Good governance asks why the shadow ledger appeared and whether its useful function should be absorbed into the canonical system.

Audit

Audit is an independent or structured examination of whether records and controls represent reality sufficiently well.

Resource audits can test:

existence;
quantity;
condition;
ownership;
access;
completeness;
renewal status;
compliance with rules.

Audit protects against self-confirming systems in which the same process creates, records and approves its own claims without challenge.

Controls

Controls reduce the chance that resource records become wrong or resources are misused.

authorisations;
segregation of duties;
access controls;
cycle counts;
automated validation;
approval thresholds;
exception alerts;
review checkpoints.

Controls should be proportionate to risk.

Too few controls invite error and abuse. Too many controls consume the very resources the system is trying to protect.

Resource Ownership

Every critical resource should have a named owner or custodian responsible for its state.

Ownership in this sense means accountability, not necessarily legal title.

The owner should know:

what healthy looks like;
how state is measured;
what triggers renewal;
what dependencies matter;
what failure would affect.

Resources without owners tend to become everyone’s problem after they fail.

Accountability and Authority

An owner who is accountable but lacks authority cannot protect the resource effectively.

Conversely, authority without accountability can encourage careless use.

Resource governance works best when responsibility, decision rights and information align.

Resource Accounting in a Household

A household already practises resource accounting, even if it never uses the term.

bank balances track financial stock;
calendars track time commitments;
food cupboards track inventory;
maintenance schedules track household equipment;
insurance tracks some contingent risks;
health and energy determine human capacity.

The mistake is to track only money.

A household can be financially solvent but time-poor, sleep-deprived or overloaded with maintenance obligations.

A fuller household resource account helps explain why a plan that fits the budget may still be impossible.

A Household Example

A family considers buying a second property.

The financial spreadsheet shows the mortgage is affordable.

But a broader resource account reveals additional commitments: renovation decisions, commuting time, maintenance, insurance administration and reduced emergency liquidity.

The purchase may still be worthwhile. But the decision is now based on the full resource bundle rather than one account.

Resource Accounting in Education

Schools and learners operate with resource systems that are often measured poorly.

teacher time;
student attention;
lesson time;
classroom capacity;
curriculum coverage;
prerequisite knowledge;
feedback capacity;
practice opportunities.

Counting hours alone does not reveal whether the learning resource base is healthy.

A learner can spend many hours while attention quality and prerequisite knowledge are depleted. A teacher can deliver all planned lessons while marking and feedback backlog grows.

Educational resource accounting should connect time spent to learning capability created.

A Student Resource Ledger

A useful student ledger does not need to be complicated.

topics known securely;
topics partly known;
topics not yet learned;
error patterns;
available study hours;
high-quality attention windows;
teacher feedback available;
practice completed;
revision due.

This converts “I studied a lot” into a more useful picture of remaining capability and remaining work.

The First Weak Link as an Accounting Problem

When a learner struggles, the visible shortage may not be the real shortage.

The student may appear to need more practice while the true missing resource is prerequisite understanding. The learner may appear to need more study time while the real constraint is feedback. The learner may appear careless while cognitive fatigue is depleting attention quality.

Diagnosis is therefore a resource-accounting act: identify what is actually missing before adding more of what is already abundant.

Resource Accounting in Business

Businesses account carefully for money because money can end operations quickly.

But other resource accounts matter just as much.

inventory;
machine capacity;
staff skills;
customer trust;
supplier capacity;
technical debt;
maintenance backlog;
data quality;
management attention.

A business can be profitable while one of these accounts is deteriorating.

Resource accounting asks whether that deterioration is temporary, intentional and recoverable—or whether the business model depends on it continuing unseen.

A Business Example

A software company has strong revenue and a full product roadmap.

Its financial accounts look healthy.

But the engineering resource ledger shows a different story: unresolved defects are rising, senior engineers are overloaded, documentation is thin and release recovery is consuming more time every quarter.

The company is accumulating technical and human-resource debt.

Resource accounting reveals a future obligation that current revenue alone does not explain.

Resource Accounting in Manufacturing

Manufacturing makes resource accounting visible because physical flows can often be measured directly.

raw material enters;
work-in-progress accumulates;
finished goods leave;
scrap is created;
machines consume remaining life;
maintenance restores condition;
energy and labour support conversion.

A strong manufacturing account connects material yield, quality, throughput, maintenance and inventory rather than treating each as a separate universe.

Material Yield

Material yield compares useful output with material input.

Low yield indicates that resource is being lost through scrap, defects, trimming, contamination or another conversion loss.

Yield is therefore both a production measure and a resource-accounting measure.

Resource Accounting in a City

A city is one of the largest everyday resource systems.

land;
water;
roads;
rail;
electricity infrastructure;
housing;
schools;
hospitals;
parks;
public finances;
institutional capability.

Urban accounting becomes difficult because many assets are long-lived and their decline is gradual.

A bridge can serve today while creating a future renewal requirement. A drainage system can be adequate under yesterday’s conditions but inadequate under new demand. Land used now can reduce future optionality.

City resource accounting therefore needs condition, remaining life and future replacement waves—not just asset counts.

A City Example

A city reports that almost all roads remain open and serviceable.

That sounds healthy.

But the age profile shows a large cohort built in the same decade. Maintenance backlog is rising and several major renewals will fall due within the same five-year window.

The present stock is adequate. The future replacement liability is concentrated.

Resource accounting reveals the wave before the wave arrives.

Resource Accounting in Government

Governments manage resources whose useful lives can span decades or generations.

Public accounting therefore benefits from separating current expenditure from changes in the underlying resource base.

A society can increase current services while drawing down infrastructure quality, fiscal buffers or natural resources. It can also spend heavily today to build assets that increase future capability.

The resource question is not simply whether spending rose or fell.

Did the public resource base become stronger or weaker?

Natural Resource Accounting

Natural resources require accounts because extraction, regeneration and environmental quality unfold over long periods.

A useful natural-resource account can record:

physical stock;
quality;
extraction;
regeneration;
loss;
location;
ecosystem dependencies;
restoration needs.

The important insight is that economic output can rise while a natural resource stock is being depleted.

Resource accounts make that exchange visible.

Water Accounts

Water accounting demonstrates the need to track stock, flow, quality and geography together.

A region can receive large annual rainfall but still face shortages if storage, timing, quality or distribution are inadequate.

A useful water account therefore includes inflow, storage, withdrawals, leakage, treatment, quality and replenishment.

Land Accounts

Land is unusual because location is inseparable from value and capability.

One hectare in one place is not interchangeable with one hectare elsewhere.

Land accounts therefore need location, permitted use, access, environmental condition, infrastructure connection and future planning role.

Unused land can represent waste—or strategic optionality. Accounting should record its intended role before judging utilisation.

Energy Accounts

Energy accounting tracks not only energy quantity but source, timing, storage, conversion loss and availability.

One unit of energy at the wrong time or place may be less useful than another. Different energy carriers also have different storage and conversion characteristics.

Energy accounts therefore become more informative when they connect physical quantities to system capability.

Human Resource Accounting

Human capability is one of the hardest resources to account for because people are not inventory.

Human-resource accounting should never reduce people to interchangeable units.

Instead, it can record capabilities the organisation depends upon:

skills;
experience;
availability;
workload;
succession depth;
training state;
critical knowledge concentrations.

Headcount is only the beginning.

Skill Inventories

A skill inventory records which capabilities exist, at what depth and in how many people.

Its purpose is not surveillance. It is resilience.

If one critical process depends on one person, the organisation has a concentration risk that ordinary headcount will not show.

Succession planning is therefore a form of resource accounting and renewal.

Workload Accounts

Workload accounting compares required work with sustainable human capacity.

A team can appear fully staffed while every person is operating beyond sustainable load.

Overtime can temporarily expand output, but it should not automatically be counted as permanent capacity.

The ledger should distinguish normal capacity, surge capacity and recovery requirements.

Attention Accounts

Attention is a scarce, renewable resource whose quality changes during the day.

An hour of distracted attention is not identical to an hour of deep concentration.

Attention accounting can therefore be useful for students, knowledge workers and decision-makers.

The objective is not to count every minute. It is to understand whether high-value work is consuming the limited periods in which high-quality attention is available.

Trust Accounts

Trust is difficult to quantify precisely, but systems still need to observe its condition.

Signals can include repeat behaviour, complaint patterns, contract friction, verification burden, employee retention or stakeholder confidence.

The important accounting insight is that trust can be spent.

A system can extract short-term value by violating expectations, but future transactions become more expensive when trust must be replaced by monitoring and enforcement.

Knowledge Resource Accounting

Knowledge estates need accounting because scale creates duplication, staleness and ambiguity.

A knowledge resource account can record:

canonical owner;
topic;
version;
source quality;
freshness;
relationships;
permissions;
supersession state;
retrieval performance.

Without such accounting, a library can become larger while becoming harder to trust.

Duplicate Knowledge

Duplicate knowledge is not automatically harmful.

Different explanations can serve different audiences. Mirrors can increase resilience. Summaries can improve access.

The accounting problem begins when duplicates compete for the same canonical job without clear ownership.

A mature library records whether a resource is canonical, derivative, historical, specialised, navigational or experimental.

Canonical Ownership

Canonical ownership gives one resource the primary responsibility for a defined question or reader job.

Other resources can link, extend, specialise or contextualise without pretending to own the same role.

This reduces cannibalisation and creates a clearer knowledge graph.

Resource Accounting in Supply Chains

Supply chains are accounting systems as much as transport systems.

They must know:

what exists;
where it is;
who owns it;
what condition it is in;
when it will arrive;
what has already been promised.

A supply chain becomes unreliable when the informational representation of goods drifts away from the physical flow.

In-Transit Resources

Resources in transit are neither at origin nor yet usable at destination.

Accounting must preserve their identity and state across the handoff.

In-transit uncertainty is why logistics depends on tracking, estimated arrival times and custody records.

Pipeline Inventory

Pipeline inventory is resource committed to the system but not yet available for use.

Ignoring pipeline inventory can lead to over-ordering. Treating it as immediately available can lead to stockouts.

Good accounting distinguishes present stock from expected future inflow.

Resource Accounting in Computing

Computing systems perform resource accounting continuously.

memory is allocated and released;
storage is consumed and reclaimed;
CPU capacity is scheduled;
network bandwidth is measured;
permissions determine access;
logs record events;
quotas limit consumption.

When these accounts fail, systems can crash, leak resources or deny legitimate users access.

Resource Leaks

A resource leak occurs when capacity is consumed but not properly released, recovered or recorded.

Memory leaks are a familiar computing example. The same architecture appears elsewhere: unused subscriptions continue charging, reserved inventory remains locked after a cancelled order, management attention remains committed to dead projects.

Leak detection is therefore an accounting problem.

Quotas

Quotas limit how much resource one user or process can consume.

They protect shared systems from one actor exhausting common capacity.

Quotas make consumption visible and enforceable, but they need review because rigid limits can underuse abundant resources or block high-value work.

Resource Accounting in Artificial Intelligence

AI systems require resource accounting across several layers.

compute budget;
context budget;
tool permissions;
retrieval sources;
token consumption;
latency;
model availability;
data freshness;
evaluation capacity;
human-review capacity.

A model can be highly capable while the surrounding resource architecture is poorly accounted for.

Then costs rise unexpectedly, tools fail, stale knowledge enters answers or high-value tasks compete with low-value ones for the same constrained resources.

AI resource accounting makes the runtime inspectable.

Context Accounting

Active context is a bounded resource.

Every piece of irrelevant information consumes space that could be used by relevant evidence, instructions or reasoning.

Context accounting therefore asks:

what information must remain active?
what can be compressed?
what can be retrieved later?
what can be discarded?
what information is authoritative?

This is resource allocation inside reasoning itself.

Tool Access Accounting

AI systems often possess tools that are not universally available to every task or user.

The ledger should distinguish:

tool exists;
tool connected;
authentication valid;
permission granted;
confirmation required;
usage limit remaining.

This prevents the system from confusing theoretical capability with executable capability.

Cost Accounting for AI

AI tasks can consume models, compute, search, storage, human review and external services.

Cost accounting should connect resource use to task value.

A powerful model may be justified for a high-stakes research problem and wasteful for a simple routing task. A deep search may be justified when freshness matters and unnecessary when stable knowledge already exists.

Resource accounting therefore supports intelligent routing.

Resource Accounting and Automation

Automation can improve resource accounting by collecting measurements continuously, reconciling records and surfacing exceptions.

But automation can also scale accounting errors.

If the classification is wrong, automated systems can repeat the wrong classification millions of times.

Automated accounting therefore needs validation, audit trails and human review for important exceptions.

Sensors

Sensors turn physical state into data.

They can measure temperature, pressure, vibration, location, energy use, occupancy and many other resource properties.

Sensors reduce the delay between reality changing and the ledger noticing.

But sensor quality, calibration and communication reliability become new resources the accounting system depends upon.

Digital Twins

A digital twin is a digital representation of a physical or operational system that is updated using observations from the real system.

In resource accounting, the important principle is not the label. It is the attempt to keep representation and reality aligned closely enough to support decisions.

The better the representation, the earlier the system can detect depletion, failure or mismatch.

The Dashboard Trap

A dashboard can display many numbers and still hide the resource problem.

Measurement is useful only when the metric represents the underlying capability.

Headcount can rise while skill depth falls. server count can rise while latency worsens. lesson hours can rise while understanding falls.

A good resource dashboard therefore favours causal relevance over visual abundance.

Vanity Metrics

A vanity metric looks impressive but changes little about the decisions that matter.

Large totals are especially seductive.

total documents;
total registered users;
total inventory;
total training hours;
total infrastructure length.

These numbers may be useful, but they become dangerous when treated as substitutes for quality, activity, access or outcome.

Leading and Lagging Indicators

Lagging indicators show what has already happened.

Leading indicators signal changes in the resource base before output fails.

For example:

breakdowns are lagging; rising vibration may be leading;
resignations are lagging; sustained overload may be leading;
stockouts are lagging; falling days of cover may be leading;
student failure is lagging; repeated prerequisite errors may be leading.

Resource accounting is strongest when it detects deterioration early enough to renew the resource before capability collapses.

The Accounting Lag

Accounting lag is the delay between reality changing and the system recording the change.

High lag is dangerous in fast-moving systems.

If inventory data updates weekly but stock can disappear in hours, the ledger is too slow. If staff capability is reviewed annually while a critical project depends on changing expertise, the account may be stale.

The useful accounting frequency should match the speed of the resource.

The Granularity Problem

Accounting can be too coarse or too detailed.

Too coarse, and important differences disappear. Too detailed, and measurement cost overwhelms decision value.

The right granularity is the level at which different resource states would change a decision.

The Boundary Problem

Every account has a boundary.

A firm may count resources it owns but depend heavily on public infrastructure, supplier expertise or environmental systems outside its formal boundary.

Resource accounting becomes misleading when critical dependencies outside the boundary are treated as infinite or guaranteed.

A mature system therefore records external dependencies even when it does not own them.

Externalised Resource Costs

A system can improve its own apparent resource efficiency by shifting costs elsewhere.

Waste can be exported. pollution can be imposed on others. unpaid care can support labour markets. supplier inventories can absorb variability that the buyer no longer carries.

Resource accounting should therefore ask whether lower internal cost represents genuine efficiency or merely movement of the burden beyond the accounting boundary.

Full-Cost Resource Accounting

Full-cost resource accounting attempts to include the wider resources consumed in producing an outcome.

The purpose is not to make every decision impossible by counting everything in the universe.

It is to include the major costs that would change the conclusion if ignored.

This is another application of materiality.

Resource Accounting and Circularity

Circular systems require accounts that follow resources beyond first use.

A component may be reused, repaired, remanufactured, recycled or discarded.

Resource accounting makes these return flows visible.

Without return-flow accounting, circularity remains a slogan rather than an operating system.

Resource Recovery Accounts

Recovery accounting measures how much useful resource is captured after use.

materials recovered;
components reused;
energy recovered;
knowledge captured from completed projects;
skills transferred before retirement.

The last two examples matter because circularity is not only physical.

Organisations can recover knowledge before people leave and reuse lessons before projects repeat old mistakes.

Resource Accounting and Sustainability

Sustainability becomes measurable when the system compares present use with renewal and future capability.

The basic question is:

Is the resource base at least as capable after this period as it needs to be for the next one?

For renewable resources, this may mean regeneration keeps pace with use. For infrastructure, it may mean renewal keeps pace with deterioration. For human resources, it may mean training and recovery keep pace with workload and turnover.

Intergenerational Accounts

Some resource decisions move capability across generations.

Current users can consume inherited natural resources, infrastructure, fiscal reserves, institutional trust and knowledge.

They can also create new assets and capabilities for future users.

Intergenerational resource accounting asks what is being passed forward, not simply what is being produced today.

Resource Accounting and Civilisation

Civilisation is a vast intergenerational resource system.

Each generation inherits:

knowledge;
institutions;
infrastructure;
land;
ecological systems;
technology;
social trust;
financial claims and obligations.

It converts those resources into present life while adding, renewing or depleting parts of the inheritance.

The health of civilisation cannot therefore be understood from current output alone.

It also depends on the condition of the resource base being handed to the future.

The Invisible Balance Sheet of Civilisation

A civilisation can become richer in visible goods while poorer in invisible foundations.

soil quality can fall;
infrastructure can age;
institutional expertise can thin;
trust can weaken;
knowledge can fragment;
maintenance obligations can accumulate.

Conversely, a society can invest heavily today and appear less efficient in the short term while strengthening future capacity.

Resource accounting helps separate consumption from investment and resilience from apparent idleness.

Resource Accounting and Strategy

Strategy is partly a decision about which resource accounts to strengthen.

An organisation can:

build reserves;
improve quality;
increase access;
remove a bottleneck;
reduce depletion;
increase renewal;
create substitution options;
invest in conversion capability.

Resource accounting tells strategy where the system is weak enough that one intervention could change the whole outcome.

The Resource Portfolio

A portfolio view recognises that systems need different resources for different horizons.

resources for current operations;
resources for resilience;
resources for maintenance;
resources for future growth;
resources for experimentation;
resources for recovery.

A system that allocates everything to current output may maximise today’s visible performance while starving tomorrow’s renewal.

Operating Resources and Strategic Resources

Operating resources support ordinary work now.

Strategic resources preserve future options or protect critical capability.

Cash for payroll is operating resource. cash reserve for disruption is strategic. classroom time for today’s lesson is operating resource. teacher-development time that improves future instruction is strategic.

Accounting should preserve this distinction so strategic resources are not quietly consumed by ordinary pressure.

The Temptation to Spend the Buffer

Buffers look idle during calm periods.

This creates pressure to convert them into present output.

Resource accounting protects the buffer by making its purpose explicit.

A reserve without a named risk can look wasteful. A reserve linked to a failure scenario can be evaluated rationally.

Resource Accounting and Risk

Risk changes the required resource position.

A resource with reliable replenishment needs less buffer than one with uncertain supply. A critical system with catastrophic failure consequences may require redundancy even if failure is unlikely.

Resource accounts should therefore connect state to risk, not treat every unit as equally important.

Contingent Resources

Contingent resources become available only if a particular event occurs.

Insurance claims, emergency credit lines, mutual-aid agreements and backup suppliers are examples.

They should not be counted exactly like resources already in hand because conditions, delays and counterparty reliability matter.

But ignoring them entirely also understates resilience.

Option Value

Some resources are valuable because they preserve choices rather than because they are used immediately.

Undeveloped land, cash reserves, spare capacity and modular infrastructure all contain option value.

Resource accounting should avoid declaring every unused resource inefficient when its purpose is to preserve future flexibility.

Accounting for Flexibility

Flexible resources can be redirected across several tasks.

Cash, general-purpose computing, broadly skilled staff and modular spaces often have greater option value than highly specialised resources.

Specialisation can deliver superior performance, but flexibility matters under uncertainty.

A complete resource account therefore records not only how much capability exists, but how narrowly that capability is tied to one use.

Resource Accounting Failure Modes

Count-only accounting: records units but ignores quality and condition.
Ownership-only accounting: records what is owned but not what can actually be accessed.
Input-only accounting: measures spending without linking it to outcomes.
No depletion account: current output hides future capability consumed.
No renewal account: maintenance, training and regeneration are treated as optional costs.
Double counting: the same resource is promised to several uses.
Shadow ledgers: competing sources of truth diverge.
Stale records: the ledger lags reality.
Wrong boundary: critical external dependencies are ignored.
Vanity metrics: impressive totals replace decision-relevant measures.
No confidence state: uncertain estimates are presented as exact facts.
No future liabilities: replacement and backlog obligations remain invisible.
No owner: nobody is responsible for resource health.
Over-accounting: measurement costs more than the decisions it improves.

The Resource Accounting Questions

What resource are we trying to understand?
What unit best represents its quantity?
What quality or condition dimensions matter?
How much is actually accessible?
How much is already committed or restricted?
What are the inflows?
What are the outflows?
Where are the losses?
What is being depleted?
What is being renewed?
What replacement liability is accumulating?
What hidden reserve is supporting current output?
What external dependency sits outside the accounting boundary?
How certain are the measurements?
What resource state would change the decision?

The Twelve-Field Resource Ledger

A practical resource ledger can be built with twelve fields.

Identity: what exactly is the resource?
Owner: who is accountable for it?
Stock: how much exists?
Quality: what condition is it in?
Access: how much can actually be used?
Commitment: how much is already promised?
Inflow: how is it added or created?
Outflow: how is it consumed or transferred?
Loss: what disappears without useful output?
Renewal: how is capability restored?
Liability: what future replacement or restoration is owed?
Confidence: how trustworthy and current is the record?

This framework is deliberately broad enough to apply to water, machines, data, attention, staff capability or financial reserves without pretending those resources are identical.

The Resource Accounting Ladder

Identify: decide what resources matter.
Classify: group resources by behaviour and purpose.
Count: measure quantity.
Qualify: measure condition and usability.
Locate: know where the resource sits.
Commit: record what is already allocated or restricted.
Flow: record additions, use, transfer and losses.
Reconcile: compare the ledger with reality.
Renew: record maintenance, regeneration and replacement.
Forecast: expose future liabilities and resource waves.
Stress-test: examine the account under disruption.
Learn: improve definitions and controls from real performance.

Mature systems move beyond counting and use the ledger to manage future capability.

Common Misconceptions

“If it is on the inventory, we have it.”

Not necessarily. It may be damaged, inaccessible, committed, restricted, obsolete or recorded incorrectly.

“Everything important can be converted into money.”

Money can improve comparison, but some quality, timing, ecological, human and institutional dimensions should remain visible in their own units.

“Unused resources are wasted resources.”

Not always. Buffers, reserves and option capacity may be deliberately unused until uncertainty or disruption arrives.

“Current output tells us whether the resource base is healthy.”

No. Output can remain high while reserves, quality or renewal capacity are being depleted.

“More metrics mean better accounting.”

No. Metrics are useful only when they represent resource states that matter to decisions.

“The ledger is reality.”

No. The ledger is a model that must be reconciled continuously with reality.

Key Ideas to Carry Forward

Resource accounting is the disciplined process of identifying, measuring, classifying and reconciling the resources a system owns, controls, accesses, consumes, renews, degrades, owes and must replace.

Stock, flow and state are the core grammar of resource accounting.
Nominal quantity, usable quantity, accessible quantity and deployable quantity should be separated.
Resource accounting can use physical, monetary and capability measures simultaneously.
Quality-adjusted accounting prevents damaged, stale or unreliable units from being treated as fully useful.
Access-adjusted accounting prevents inaccessible abundance from being mistaken for practical capability.
Commitments and restrictions must be recorded to prevent double-counting.
Reconciliation keeps the recorded system aligned with reality.
Depletion accounts reveal future capability being consumed by present activity.
Renewal accounts reveal how resources are restored.
Replacement liabilities and maintenance backlog are present facts about future resource requirements.
Hidden reserves can make unsustainable output look sustainable.
Criticality, timing, location and dependency matter separately from monetary value.
Resource accounting should record uncertainty rather than pretend every estimate is exact.
Strong resource accounts support strategy, resilience, sustainability and intergenerational decision-making.

The First-Principles Rule

Whenever a system says, “We have enough resources,” ask for the ledger underneath the claim.

How much exists? How much is usable? How much is accessible? How much is already committed? What is being depleted? What is being renewed? What future obligation is being created?

If those questions cannot be answered, the system may have resources but not resource awareness.

Resource accounting is how a system learns to see the foundations beneath its output.

It is the difference between knowing what we appear to possess and knowing what capability we can safely depend upon.

Teaching Guide

Teach resource accounting by beginning with a familiar stock-and-flow example such as a water bottle, bank balance or classroom stationery cupboard. Ask students to identify the starting stock, inflows, outflows and ending stock. Then introduce quality and access: what if some water is contaminated, some money is already committed, or some stationery cannot be found?

Next, move to less visible resources such as teacher attention, student energy, trust or infrastructure life. Ask learners what would count as depletion and what would count as renewal. Finally, have them build a twelve-field resource ledger for a school, household, business or city. The central lesson is that good decisions require more than counting what exists: they require a trustworthy account of what is usable now, what is being consumed and what must be restored for the future.

How Resource Accounting Works | How Systems Know What They Have, Use, Lose and Owe