"There ain't no such thing as a free lunch" expresses the idea that even if something seems like it is free, there is always a cost, no matter how indirect or hidden.
The correct answer is: "everything has a cost, if not a explicit one at least a opportunity cost".
The opportunity cost has to be considered when making a decision. It is defined as the value of the best alternative rejected when choosing a certain option. This concept shows that every good/service, even when it is consumed at a zero price, entails a cost. For example, there is a free concert in the street, but the time spent on its consumption is a resource that could be dedicated to an alternative activity that has a value and such value is the opportunity cost.
Delegates gave the continential congress, the power to request money from the states make appropriations, regulate the armed forces, appoint civil servants, and declare war.
