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What is Opportunity Cost?

Opportunity cost is the value of the next best alternative forgone when a choice is made. Every decision to spend money, time or effort on one option means giving up what that same resource could have earned elsewhere. It is not always a cash figure, but it is a real economic cost.

The concept forces decisions to account for what is given up, not just what is spent. If a founder works full-time in the business without a salary, the salary they could have earned elsewhere is an opportunity cost of running the business, even though no cash leaves the account.

Opportunity cost applies to capital too. Money tied up in inventory or equipment cannot be invested elsewhere, so the return it could have earned is a genuine cost of that choice. Comparing options by their opportunity cost, rather than their out-of-pocket price alone, is what separates a good decision from one that only looks cheap.

Example

A freelancer turns down a €5,000 project to take a €4,000 one with a better long-term client. The €5,000 forgone is the opportunity cost of choosing the €4,000 project, and the decision is justified only if the long-term client is worth at least that difference.

Questions

Is opportunity cost always a cash amount?

No. It can be time, effort or the return on capital forgone, not just money. The key is to put a value on the best alternative you give up, so the true cost of a choice is visible even when no cash changes hands.

How does opportunity cost apply to a small business?

In every resource decision: using cash to buy inventory instead of keeping it invested, or spending an owner's time on admin instead of sales. Each choice carries the value of the alternative it displaces.

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