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居民收入分布的正态特征决定消费需求增速必然存在周期性波动或半周期波动现象。各产业及整个经济因此存在由居民收入正态分布引致的增长周期。产业增长周期的振幅必定大于消费品增长周期振幅,产业结构转变必然改变经济增长周期的波动形态。企业创新引致的新产品只有作为新增需求时才会改变消费品及经济增长周期的波动形态。收入差距缩小会增加成长期与成熟期消费品需求增速,提高即期经济增速,但会降低处于初始阶段消费品需求增速,不利于新兴产业的发展,对长期经济增长不利。保持居民收入适度差距是保障经济持续较快增长的必要条件。
The normal distribution of residents’ income determines that the growth of consumer demand inevitably has cyclical or semi-cyclical fluctuations. As a result, there is a growth cycle caused by the normal distribution of household income among industries and the economy as a whole. The amplitude of the industrial growth cycle must be greater than the amplitude of the growth cycle of consumer goods. The transformation of the industrial structure will inevitably change the volatility of the economic growth cycle. New products resulting from business innovation can only change the volatility of consumer goods and the cycle of economic growth as a result of new demand. Narrowing the income gap will increase the growth rate of consumer demand in the mature and mature phases and increase the current economic growth, but it will reduce the growth of consumer demand in the initial stage, which is unfavorable to the development of new industries and unfavorable to long-term economic growth. Maintaining a moderate income gap is a necessary condition for ensuring sustained and rapid economic growth.