Most business measures describe flows: revenue this month, units produced this year, jobs completed this quarter, customers served this week. Flows matter. They show how much activity is moving through the business. What they do not show is whether the things that make that activity possible are getting stronger or weaker.
A business can increase its output while wearing out its equipment, exhausting its people, straining its supplier relationships and training its customers to wait for discounts. For a while, everything looks better. The figures are up and the bank balance is healthy. Then a machine fails at the worst moment, a key employee leaves, a supplier tightens terms or a customer walks away, and the business discovers that part of its growth was paid for by running down what it depends on.
This article explains the difference between flows and stocks, the main stocks a small business depends on, how growth can quietly consume them, why preserving value usually beats replacing it, and a small set of measures that show whether growth is building the business or using it up.
Flows and stocks
A flow is an amount over a period: revenue per year, production per week, energy used per month. A stock is an amount at a point in time: the condition of the equipment, the skills of the team, the trust of customers, the reserves of materials.
Walter Stahel, a long-time writer on the circular economy, argued in a 2016 commentary in Nature that conventional economic measures focus on flows over a period, while a circular approach aims to preserve stocks. He suggested thinking about wealth in terms of the quantity and quality of natural, cultural, human and manufactured capital. The idea translates directly into business: are we building lasting capacity to create value, or increasing throughput by consuming the assets that make future value possible?
That is not an argument against growth. It is an argument for knowing what kind of growth is happening.
The stocks a small business depends on
| Stock | Examples | Signs it is being run down |
|---|---|---|
| Equipment and buildings | Machines, vehicles, tools, premises | Maintenance backlog, rising breakdowns, deferred repairs |
| People and skills | Experience, judgement, health, training | High overtime, turnover, few people able to do critical tasks |
| Knowledge | Methods, documentation, know-how | Key processes held in one person’s head |
| Customer relationships | Trust, loyalty, reputation | Complaints, falling repeat business, customers waiting for discounts |
| Supplier relationships | Goodwill, reliability, fair terms | Suppliers tightening terms or deprioritising you |
| Licences and standing | Accreditations, permits, community goodwill | Compliance slipping, complaints from neighbours or regulators |
| Natural resources | Water, materials, energy, land quality | Rising use, scarcity, dependence on a single source |
Revenue is a flow generated by these stocks. If the business maximises the flow while degrading the stocks, performance can look strong right up until one of them becomes a constraint.
How growth runs stocks down
The pattern is familiar in maintenance. A business can increase output by delaying servicing and shutdowns. Production rises in the short term. Equipment condition falls. Eventually the deferred cost returns as a breakdown, downtime or early replacement, usually at a worse time and higher cost than the planned work would have been.
The same pattern appears elsewhere:
- People: growth delivered through sustained overtime and skipped training wears down health, morale and skills, and eventually leads to resignations.
- Knowledge: when everyone is too busy to document methods or train others, critical know-how becomes concentrated in a few people.
- Customers: sales driven by deep discounts can grow revenue while teaching customers to wait for the next discount.
- Suppliers: stretching payment terms improves cash flow until suppliers raise prices, tighten terms or serve you last.
- Resources: growth that depends on rising use of a scarce input increases exposure to its price and availability.
Accounting assets are not the whole picture
The balance sheet records equipment, property and some intangible assets. It does not record the depth of the team’s skills, the goodwill of suppliers, the trust of neighbours or the health of the people doing the work. These stocks can be strategically critical without appearing anywhere in the accounts. The accounts remain essential; they simply do not show everything the business depends on.
Intensity, scale and condition
Three questions help separate different kinds of progress:
- Intensity: how much resource, effort or cost goes into each unit of output?
- Scale: how much total resource, effort or cost is the business using?
- Condition: what is happening to the underlying stocks the activity depends on?
A dashboard showing only intensity can give false comfort, because efficiency per unit can improve while totals rise and stocks fall. The efficiency is a rate, impact is a total article looks at the first two in more detail. This article adds the third.
Preserve the highest value you can
Stahel’s work on the circular economy describes a hierarchy of ways to keep value in use:
- maintenance keeps an asset working;
- reuse keeps the whole product in service;
- repair restores function;
- remanufacturing preserves components and the value built into them;
- recycling recovers some material value once the other options are exhausted.
The order matters. Scrapping a working machine to recover its metal technically counts as recycling, but it throws away most of the value invested in its design, manufacture and assembly. A useful rule is to preserve the highest level of value that remains economically and technically sensible. In practice, this makes circularity look more like good asset management than waste management. The durability is sustainability article covers designing products that last.
Buying decisions shape future stocks
Purchasing decisions often favour the lowest price today. A stock perspective asks what the purchase does to the business’s capacity over time. Suppose two machines do the same job:
- Machine A is cheaper, but uses proprietary consumables, is hard to repair and cannot be upgraded.
- Machine B costs more, but is modular, easy to maintain locally and upgradeable.
A narrow comparison picks A. A whole-of-life comparison that considers downtime, repair costs, upgrade options and residual value may pick B. The buying for the whole life of equipment article describes how to make that comparison.
Track a few stock measures
There is no need for a large dashboard. Pick the few stocks that could genuinely limit the business and track one or two measures for each, alongside the usual flow measures:
- Equipment: maintenance backlog in hours, breakdowns per month, planned versus unplanned maintenance.
- People: average overtime, staff turnover, number of people able to do each critical task.
- Knowledge: whether key processes are documented and someone else has been trained.
- Customers: repeat business, complaints, share of sales at discount.
- Suppliers: on-time payment to suppliers, supplier delivery performance.
- Resources: total use of critical inputs, not just use per unit.
Review them monthly or quarterly. A business that grows while these measures improve is building wealth. A business that grows while they deteriorate is borrowing from its future.
Running a stock down can be a deliberate choice
Sometimes drawing on a stock is the right decision. A business may run its equipment hard for a few months to win a large contract, ask staff for extra hours through a peak season or accept slower payment from a strategic customer. The difference between a sound choice and quiet depletion is that the sound choice is made openly, with a limit and a plan to rebuild. Write down which stock is being drawn on, for how long, how far it will be allowed to fall and when it will be restored. A maintenance backlog that is planned and scheduled is a decision. One that simply grows is a warning.
Six questions for significant decisions
| Question | What it tests |
|---|---|
| Which stock does this decision use up? | Dependence |
| Which stock does it strengthen? | Capability |
| What condition will that stock be in after five years? | Long-term resilience |
| Is the resource renewable, recoverable or scarce? | Exposure |
| Can value be kept through maintenance, reuse or repair? | Circular potential |
| Are we improving efficiency while total use still rises? | Scale effect |
A worked example
This is an illustration. A civil and earthmoving contractor with 25 staff grows revenue by about 30% over two years. On the usual measures, things look excellent: more jobs, higher revenue, good cash flow.
The owner then reviews the stocks:
- Equipment: the maintenance backlog has grown from about 40 hours to about 140 hours, because machines are always out on jobs. Unplanned breakdowns have doubled.
- People: operators are averaging about 12 hours of overtime a week. Two experienced operators have resigned in six months.
- Suppliers: to protect cash flow, the business has been paying its main fuel and parts supplier late. The supplier has just moved the business to payment on delivery.
- Customers: still satisfied, but two have mentioned that crews seem rushed.
Then an excavator fails mid-job. The repair costs $38,000, and the machine is out for nine days, costing an estimated $2,400 a day in lost margin, or $21,600. The incident costs about $59,600, far more than the deferred servicing would have.
The owner changes course:
- Maintenance windows are scheduled each quarter, accepting about six fewer billable machine-days per quarter in exchange for fewer breakdowns.
- Overtime is capped, and an apprentice operator is hired and paired with the most experienced operator.
- Supplier invoices are paid on terms, and the owner meets the supplier to restore normal arrangements.
- A monthly stock check is added to the management meeting: maintenance backlog, breakdowns, overtime, turnover and supplier payment days.
Growth slows slightly for two quarters. After a year, breakdowns have fallen, overtime is down, no further operators have left and the supplier has restored credit terms. The business is still growing, but now it is growing on a stronger base rather than consuming it.
How this applies to a small Australian business
Small businesses often grow by asking more of the same people and equipment, which makes stock depletion easy to miss until it bites. Practical steps:
- List the stocks your business depends on, including those not on the balance sheet.
- Track one or two measures for each critical stock alongside revenue and output.
- Schedule maintenance rather than deferring it during busy periods.
- Watch overtime and turnover as signs of running down people.
- Spread critical knowledge through documentation and training.
- Pay suppliers on terms and treat their goodwill as an asset.
- Compare whole-of-life costs when buying equipment.
- Preserve value through maintenance, repair and reuse before replacement.
- Check obligations on working hours and fatigue for your industry; Safe Work Australia and state regulators publish guidance.
Signals worth watching
- Revenue rising while equipment condition falls.
- Maintenance backlog growing faster than output.
- Sustained overtime and rising turnover.
- One or two people holding all the knowledge of a critical process.
- Suppliers tightening terms.
- Growing dependence on discounts to make sales.
- Efficiency improving per unit while total use of a scarce input rises.
Common mistakes
- Measuring only flows.
- Deferring maintenance to meet short-term demand.
- Treating overtime as free capacity.
- Assuming the balance sheet shows everything the business depends on.
- Buying on price without considering repair, upgrade and downtime.
- Recycling or replacing when maintenance or repair would preserve more value.
Frequently asked questions
Isn’t some deferred maintenance unavoidable in a busy period? Sometimes. The key is to know how much is deferred, schedule it deliberately and not let it build up indefinitely. Track the backlog so it stays visible.
How do we measure something like supplier goodwill? Use simple proxies: whether you pay on time, whether suppliers give you priority when supply is tight, and whether terms are improving or tightening.
Will this slow our growth? Sometimes in the short term. But growth that consumes the stocks it depends on usually stalls later, often suddenly. Steadier growth on a stronger base is usually more valuable.
Which stocks should we focus on first? The ones that would stop the business if they failed: a critical machine, a key person, a main supplier or a major customer relationship.
How often should we review stock measures? Monthly for fast-changing measures such as overtime and maintenance backlog, and quarterly for slower ones such as skills depth and supplier relationships.
How do we raise this with a team that is proud of its output? Present the stock measures as protecting the output, not criticising it. People who are working long hours usually know the equipment is overdue for servicing and the workload is not sustainable. Asking them which stocks worry them most often produces a better list than any the owner could write alone.
Questions to ask
- Which stocks make our current business possible?
- Are they getting stronger or weaker as we grow?
- Which of our measures reward output while hiding depletion?
- Where are we deferring costs that will return later?
- Which asset, person or relationship could become our next constraint?
- Are we allocating money to maximise this year’s output or our long-term capacity?
Bringing it together
Output shows how much is moving through the business. Wealth depends on what remains capable of producing value afterwards. Identify the stocks the business depends on, including people, knowledge and relationships that do not appear in the accounts, track a few measures of their condition alongside the usual figures, preserve value through maintenance and repair, and buy with the whole life in mind. The better question is not only how fast the business is growing, but what it is becoming more capable of sustaining as it grows.
Source: KEVOS notes, drawing on W. R. Stahel, “The circular economy”, Nature (2016), and teaching material on resource and impact decoupling. Examples and figures in this article are illustrations.
