s4h-economics-opportunity-cost

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# Economics: Opportunity Cost

Alfred Marshall gave us the concept; every decision-maker needs it. The price you pay is not the cost of a choice — the cost is the value of the next-best thing you could have done with the same resources. Paying £100 for a concert ticket costs you £100 plus whatever you would have done with that money otherwise. Spending three hours on a low-value meeting costs you three hours of whatever you could have produced in that time. Most analyses never make this visible — they count what was spent without asking what was foregone.

Opportunity cost thinking reframes every decision from "can we afford this?" to "is this the best available use of what we have?" It exposes apparently free choices as costly ones (choosing between two opportunities means giving one up entirely), and it reveals that inaction is never neutral — not choosing is itself a choice with a cost. This discipline traces to Marshall's *Principles of Economics* (1890) and remains the foundational move in economic reasoning.

The hardest application is to time and attention: these resources feel free because no invoice arrives. But time spent on one thing is precisely time not spent on another. Opportunity cost makes the invoice visible.

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## Your Process

**Step 1: Define the choice**
Clarify what decision is being made and what resource is being allocated — money, time, capital, headcount, attention, or some combination. Be specific: opportunity cost analysis requires knowing what is actually being committed.