什么是NNP？什么是NI、PI、DPI？

NNP(Net National Product) is the total market value of final goods and services produced in the economy in a given period of time， excluding the depreciation of capital。 简单地说，NNP=GNP-折旧。 NI(National Income) is the income earned by the factors of production。 简单地说，国民收入NI=NNP-间接税和企业转移支出+政府对企业补贴。 PI(Personal Income) is the income received by households。 简单地说，个人收入PI=NI-挣到但没有收到的收入+收到的但不是挣到的收入（政府对私人的转移支出）。 DPI(Disposable Personal Income) is income remaining after paying personal income taxes。 简单地说，DPI=PI-所得税=个人消费C+个人储蓄S。