A concept · How Incentives Run Everything · Economics

Opportunity Cost

The true cost of a choice is the best one you gave up.

What does a free evening cost? Nothing was paid for it, so it gets spent on whatever is nearest: the feed, the second episode, the errand that could have waited. Yet that evening could have been the friend called or the thing finally made, and the best of those is exactly what the evening cost. A council describes a site it already owns as free land for a stadium, when the same land could have been sold or built on. Why do the things with no price tag end up as the things we waste?

What Opportunity Cost means

Opportunity cost is the value of the best alternative given up when a scarce resource, whether money, time, attention or land, is committed to one use rather than another. The true cost of a choice is not what was paid but what could otherwise have been had. Owning this changes how we read a price tag, and especially a price tag of zero. We stop asking what something costs and start asking what the best other use of the same hours or pounds would have been. We notice that every choice is a choice over something else, and that the something else is the cost. Before, cash sitting in the account was safe and costless. After, holding it costs the best thing it could have done every single quarter.

Opportunity Cost examples: where it shows up

  • At work: a founder spends their own hours on tasks anyone could do, because their time has no invoice, and the work only they could do goes undone.
  • With money: a company holds retained cash because holding feels free, while the return it could have earned or paid out is spent every day in silence.
  • In the news: a government calls a project cheap because the land was already public, leaving out the housing or the sale that the land will now never become.

Where it sits

Open to walk. See where Opportunity Cost sits on the sky →

Nearest on the sky

A filled dot marks a star that is already open to walk.

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