Content abstract: economics class, the teacher gave us about western economics decorate some problems for social class, the paper discussed LiuShanMin teachers had stumbled in the economist 2004.8.26 published "the macroeconomics website of the actual production" penny from about national income "accounting" and "decision" of economic theory, a two-year cause some thinking. National income accounting decision national income is not the same thing, because income accounting is static, itself is balanced, income is dynamic, and the decision by several leading factors, so often does not equal savings and investment. We, according to his class in the library of knowledge and to talk about your own data access some experience. Content abstract: economics class, the teacher gave us about western economics decorate some problems for social class, the paper discussed LiuShanMin teachers had stumbled in the economist 2004.8.26 published "the macroeconomics website of the actual production" penny from about national income "accounting" and "decision" of economic theory, a two-year cause some thinking. National income accounting decision national income is not the same thing, because income accounting is static, itself is balanced, income is dynamic, and the decision by several leading factors, so often does not equal savings and investment. We, according to his class in the library of knowledge and to talk about your own data access some experience.