Opportunity cost — Economics, 11–13 years
Every choice uses something limited, so it closes off another possibility. Opportunity cost names the best important thing you give up, not every possible thing.
What you give up
The opportunity cost of a choice is the best alternative you do not choose. If you spend an hour gaming instead of reading, the cost is the reading you consider most valuable, not every activity you could have done. It is about the next-best option, not the price tag.
Why this idea helps
People often count what a choice gives them but forget what it prevents. That can make a free-looking decision seem costless. Opportunity cost was developed to make the hidden sacrifice visible, so choices can be compared more honestly.
A Saturday choice
Leo has three free hours on Saturday. He can earn €18 helping a neighbour, practise football, or watch a film; football is his next-best choice after earning money. If he helps the neighbour, his opportunity cost is the football practice, not €18. If he chooses football, the cost is the €18 he gives up.
It is not every lost option
A reasonable mistake is to call every unchosen activity an opportunity cost. There may be ten things you could do, but only the best alternative matters for this idea. Listing everything can hide the real comparison instead of clarifying it.
Decisions in real life
A family uses opportunity cost when it chooses between a holiday and replacing an old car. A town uses it when land for a new school cannot also become a sports field. You can use it too: ask what valuable alternative your choice leaves behind before saying that something is free.
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