Which economic concept is the closest parallel to the saying, "There's no such thing as a free lunch"?

Question

Quizplus · Accepted Answer

The saying "There's no such thing as a free lunch" refers to the concept of opportunity costs, which means that whenever we choose to use our resources (time, money, etc.) in one way, we are giving up the opportunity to use them in another way. In other words, every decision we make has a cost, even if it's not immediately apparent. This is similar to the concept of opportunity costs in economics, where choosing to produce more of one good or service means sacrificing the opportunity to produce more of another.

Which Economic Concept Is the Closest Parallel to the Saying