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We take it as a fundamental psychological rule of any modern community that, when its real income is increased, it will not increase its consumption by an equal absolute amount.

我们把它作为任何现代社会的一项基本心理规则，即当它的实际收入增加时，它不会以同样的绝对数量增加其消费。

— John Maynard Keynes 凯恩斯