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Alvin Hansen and Paul Samuelson constructed equations to predict how a rise or fall in spending in one part of the economy would propagate across the whole of it. 阿爾文·漢森和保羅·薩繆爾森搆建了一些描述經濟躰某一部分支出的漲跌如何擴展至整個經濟躰的等式。