Efficiency is no longer the only operating objective
For decades, one of the dominant ideas in business operations was that unused capacity represented waste. Factories were expected to run close to optimal utilisation, inventories were kept lean, supplier bases were consolidated and working capital was squeezed out of the system. The logic was compelling: every idle machine, spare warehouse slot or additional supplier appeared to carry a cost without producing immediate revenue.
That logic is being revised. Companies are operating in an environment where disruption is less likely to be a short interruption and more likely to be a recurring feature of business. Volatility in shipping, energy, technology, regulation and demand can expose the weakness of systems designed with almost no room for error. As a result, spare capacity is increasingly being reconsidered not as inefficiency, but as operational insurance.
The World Economic Forum's Global Value Chains Outlook 2026 described volatility as a structural condition and found that 74% of surveyed business leaders viewed resilience investment as a driver of growth. The shift is significant because it reframes resilience from a defensive expense into a component of competitiveness.
The hidden cost of running too close to the limit
A highly optimised system can perform extremely well when conditions are predictable. The problem appears when one part of the system is unavailable. A production line operating near full capacity may have little ability to absorb a surge in demand. A company reliant on one specialist supplier may have no quick substitute if that supplier experiences a failure. A distribution network with minimal inventory can become fragile when transport times increase.
These weaknesses often remain invisible during normal periods. Traditional efficiency metrics can even reward them. Lower inventory can improve working-capital measures. Fewer suppliers can reduce procurement complexity. Higher utilisation can improve unit economics. But the same choices can increase the cost of disruption because there is no alternative route when the primary route fails.
This creates a measurement problem. Efficiency is easy to observe every quarter; resilience is often valued only when something goes wrong. Companies are therefore beginning to look for ways to measure the economic value of optionality before a disruption occurs.
Spare capacity is becoming a portfolio of options
The term capacity buffer does not mean keeping expensive assets idle without discipline. It can take many forms. A manufacturer may maintain additional production capability at a second site. A retailer may hold more safety stock for selected products. A technology company may preserve extra cloud capacity. A service business may cross-train staff so work can move between teams when demand changes.
The common feature is optionality. The company has an alternative that can be activated when the normal operating plan stops working. The value of that alternative depends on how quickly it can be used, how much it costs to maintain and how damaging a disruption would otherwise be.
This portfolio view helps explain why companies are becoming more selective rather than simply abandoning efficiency. Buffers are most valuable around bottlenecks: components with long lead times, facilities with no substitute, suppliers that control specialised inputs, or processes where downtime has unusually high consequences. Resilience spending becomes more rational when it is concentrated where failure would have the greatest economic impact.
Supply chains are being redesigned around optionality
The World Economic Forum's 2026 value-chain work argues that supply chains increasingly need to be designed around orchestration, distributed scale and optionality. That direction differs from the older model in which production was concentrated wherever unit costs were lowest and inventory was minimised across the chain.
Supplier diversification is one example. A second supplier may initially look more expensive than concentrating volume with the lowest-cost provider. But the additional relationship can be valuable if it gives the buyer another source of supply during a disruption, a benchmark for pricing or greater negotiating flexibility. The same applies to regional production footprints. Splitting capacity across locations can increase complexity but reduce dependence on a single site or transport corridor.
The strategic question is therefore moving from 'What is the cheapest configuration today?' to 'What configuration performs acceptably across a wider range of conditions?' The second question is less precise, but it may produce a business that is better able to protect revenue when assumptions change.
Inventory is being reconsidered as a continuity asset
Inventory has been one of the clearest targets of lean management because stock consumes cash, storage and insurance. Yet inventory also buys time. A company with several weeks of critical inputs can continue operating while it searches for a replacement supplier. A company with no buffer may have only days or hours.
The key is not to maximise inventory but to differentiate it. Commodity items with many substitutes may require little protection. Highly specialised components with long replacement times may justify a larger reserve. The same logic applies to spare parts, maintenance materials and finished goods in markets where lost availability quickly translates into lost customers.
OECD analysis of resilience in 2026 highlighted the role of inventory buffers in determining how exposed firms are to supply shocks. It also noted that vulnerability can be amplified by limited diversification, tight liquidity and constrained financing. This reinforces an important point: operational buffers and financial buffers are connected. Inventory is useful only if the company can afford to hold it and finance the working capital that comes with it.
Financial headroom is part of operational capacity
Capacity is not only physical. Cash, borrowing facilities and uncommitted financing can also function as buffers. A company may need to pay higher freight costs, secure replacement materials, build inventory or fund temporary losses when operations are disrupted. Without liquidity, the business may know how to respond but lack the ability to do so.
This is why resilience decisions increasingly cross traditional functional boundaries. Procurement, operations, treasury and finance cannot optimise independently. A supply-chain team may want additional stock, while finance sees cash tied up on the balance sheet. The right answer depends on the cost of the buffer compared with the expected cost of interruption.
That calculation is difficult because the timing of disruption is uncertain. But uncertainty does not make the buffer worthless. Insurance has value even when a claim is never made. The same principle can apply to unused credit, alternate suppliers and spare production capability.
The productivity challenge
There is an obvious tension. Businesses still need productivity growth, and maintaining too much spare capacity can weaken returns. The OECD's 2026 productivity compendium notes that investment remains central to upgrading capital, adopting technology and improving productivity. It also shows that economy-wide investment rates have remained below their pre-financial-crisis average across the OECD.
Companies therefore cannot treat resilience as a licence for undisciplined spending. The goal is to create buffers that improve the system's ability to adapt without permanently undermining economics. Technology can help. Better demand forecasting can reduce the amount of inventory required for a given service level. Digital twins can show how a plant would respond to a constraint. Supplier data can identify dependencies that are not obvious from direct purchasing relationships.
In this sense, resilience and efficiency are not necessarily opposites. Better information can allow companies to place smaller, smarter buffers exactly where they create the greatest value.
Boards are beginning to ask different questions
Operational risk has traditionally been discussed in terms of business continuity plans and emergency response. The capacity-buffer model asks more strategic questions. Which parts of the business have no substitute? How long could the company operate if a critical supplier stopped delivering? Which facilities are running at utilisation levels that leave no room for recovery? How much extra demand could the system absorb without service failure? How quickly could production or fulfilment move to another location?
These questions make resilience measurable. They also allow the board to connect operational architecture with financial exposure. A five-day disruption may be manageable in one business but catastrophic in another. The size of the required buffer should reflect the economics of that difference.
Scenario analysis can be particularly useful because it moves the conversation away from predicting a single disruption. Instead, management can test whether the operating model survives a range of plausible events: supplier loss, transport delays, energy constraints, demand spikes, cyber outages or the temporary closure of a major site.
The new operating model is less brittle
The most resilient companies are unlikely to abandon lean thinking. Waste still matters, working capital still matters and asset utilisation still matters. What is changing is the assumption that maximum efficiency in normal conditions automatically produces the strongest business.
A more balanced operating model accepts a small amount of deliberate slack in exchange for a larger amount of strategic flexibility. The company knows which inventories must be protected, which suppliers require alternatives, which facilities need headroom and which financing resources must remain available. It does not build redundancy everywhere; it builds it where the cost of failure is highest.
That may be one of the defining business shifts of the current period. Spare capacity is moving from the language of waste to the language of resilience. In an economy where volatility can persist, the ability to absorb disruption and continue operating may be worth more than squeezing the final percentage point of utilisation from the system.
References
• World Economic Forum, Global Value Chains Outlook 2026
• World Economic Forum, Global Supply Chains Enter Era of Structural Volatility
• OECD, OECD Compendium of Productivity Indicators 2026
• OECD, From energy shocks to stronger resilience
• McKinsey, Chokepoints: How to respond when the global economy gets squeezed