... 从国内消费转向国外消费，它实际上是对国内总支出的扣除，两者之 差我们称之为：边际支出倾向（marginal propensity to spend， MPS），即增加的实际GDP（?Y）所导致的总支出的增加量（?AE） 的比值，它就是总支出曲线的斜率。
权威例句
1.
The families that would be affected by the tax cut tend to have a higher marginalpropensitytospend, which would provide more support for the economy right away.