Opportunity Cost
Definition
Opportunity cost is the value of the best alternative given up when a resource is committed to one use — such as the return capital tied up in inventory could have earned if invested elsewhere.
In Practice
Opportunity cost is why inventory carrying cost includes a capital charge: $5 million sitting in stock is $5 million not funding expansion, debt paydown, or projects earning the company's hurdle rate — commonly 8–15% a year, before storage and risk costs are added. The same lens applies to capacity (running low-margin work displaces high-margin work on a full line), space, and management attention.
It is an economic cost, not an accounting entry, which is why it gets ignored — no invoice ever arrives for it. Disciplined supply chain analysis prices it in anyway: working-capital reduction programs, SKU rationalization, and postponement strategies are largely campaigns against the opportunity cost of capital locked in stock.
Frequently Asked Questions
How does opportunity cost apply to inventory?
Money invested in stock cannot earn a return elsewhere, so carrying cost calculations charge inventory the company's cost of capital or hurdle rate — often 8–15% annually — on its value. On $5 million of average inventory, that is $400,000–$750,000 a year before storage, insurance, and obsolescence.
Why is opportunity cost easy to ignore?
Because it never generates an invoice or ledger entry — it is the profit of the road not taken. Decisions judged only on out-of-pocket costs systematically overinvest in inventory and underinvest in alternatives. Including a capital charge in carrying cost forces the trade-off into view.
Related Calculators
Related Terms
The cost of storing one unit of inventory for a defined period, commonly expressed in dollars per unit per year. It is the per-unit form of inventory carrying cost used in lot-sizing formulas.
Intangible CostsIntangible costs are real but hard-to-quantify losses — such as damaged customer goodwill, eroded employee morale, or a weakened brand — that don't appear as line items in accounting but influence supply chain decisions.
Working CapitalWorking capital is the cash a business has tied up in day-to-day operations, calculated as current assets minus current liabilities. In supply chain terms, it is dominated by inventory, receivables, and payables.
Break-Even AnalysisBreak-even analysis is a calculation that finds the sales volume at which total revenue equals total cost, computed as fixed costs divided by the contribution margin per unit — the point beyond which each additional unit generates profit.