The famous saying, "There is no such thing as a free lunch," is an example of which economic concept?

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The saying "There is no such thing as a free lunch" exemplifies the economic concept of trade-offs, meaning that in order to obtain something, one must give up something else in return. In this case, although the lunch may be free, one may have to sacrifice time or energy to obtain it, which has an opportunity cost.

The Famous Saying, "There Is No Such Thing as a Free