gift economy是什么意思？主要内容是什么？

A gift economy is an economic system in which the prevalent mode of exchange is for goods and services to be given without explicit agreement upon a quid pro quo. Typically, this occurs in a cultural context where there is an expectation either of reciprocation—in the form of goods or services of comparable value, or of political support, general loyalty, honor to the giver, etc.—or of the gift being passed on in some other manner.