What economic concept is illustrated by the saying "You can't have your cake and eat it too"?

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The saying "You can't have your cake and eat it too" implies that making a choice to have one thing means giving up the opportunity to have or do something else. This is the essence of opportunity cost, which refers to the highest-valued alternative that must be forgone when a choice is made. The saying is often used to illustrate the principle that people face trade-offs and must make choices based on the costs and benefits involved.

What Economic Concept Is Illustrated by the Saying "You Can't