The study based on national income aggregate demand function indicates that the ratio between the investment-output efficiency and the consumption-investment rate has a relationship of inversed U shape,and its maximal value lies on the dynamic equilibrium of the consumption-investment rate and the investment growth rate.

It was not optimal general supplies equal to general demands in real economy.

There are two classical expositions about the economic utility of bonds: David Ricardo s "theorem of equal value" and Keynes view of bonds increasing general demands.

This article holds that the contraction of general demands in our country s economy has deep structural background.

The quantitative analysis of the slope of aggregate demand curve;

The influence of Monetary Transmission Mechanism on price and output are decided by the common effect of aggregate demands and aggregate supply,According to currercy quantity theory,the PY is decomposed into P and Y.

In the process of this change, the aggregate demand theory has been developed greatly, so that the aggregate-demand relation, consistent with the utility maximization and rational expectations, can be derived from a dynamic optimizing general equilibrium model and serve as a building block of the new synthesis.