政府税收增加1000亿美元,如果边际消费倾向是0.6,以下项目会发生什么变化?它们增加了,还是减少了?增加或减少了多少? a.公共储蓄 b.私人储蓄 c.国民储蓄 d.投资 The government raises taxes by $100 billion. If the marginal propensity to consume is 0.6, what happens to the following? Do they rise or fall? By what amounts? a.Public saving. b.Private saving. c.National saving. d.Investment.