I think investment is quite criticle. Investment can be both on the demand side and on the supply side. Investment is one componenet of Aggregate demand, so increase in investment will increse AD. Furthermore, increase in investment will increase the productive capacity outwards, which means increase the Aggregate supply. Therefore, investment increase both supply and demand of the economy.
[此贴子已经被作者于2007-1-31 1:29:09编辑过]


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