一个人可以出售货物和服务以得到货币收入并用收入换回所需要的其他货物和服务。

一个人可以出售货物和服务以得到货币收入并用收入换回所需要的其他货物和服务。

In normal market transactions buying and selling of goods and services is unbundled，an arrangement made possible by the use of money and the “market” as an institution.