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哈罗德所讨论的问题并非局限于经济增长,而是更具广泛意义的动态经济问题。刀刃问题实际上可以理解为动态系统中一个非稳定的不动点,该问题为我们揭示了经济社会本身所存在的某种非稳定机制。而凯恩斯的需求管理型宏观经济政策是对一个不稳定的动态经济系统输入了一个稳定机制。如果资本和劳动力之间不可能无限替代,则劳动力市场就有可能长期处于供给的无限过剩(即使此时经济增长率有可能很高,经济社会的劳动力成本有可能很低,经济社会有可能已经采用了最为劳动密集型的生产方式)。哈罗德模型揭示的这些宏观动态现象非常接近发展中国家的经济增长与波动的现实。在某种程度上,这也是过去20多年中国经济增长与波动的一种写照。
Harold’s discussion of the issue is not limited to economic growth, but more widely dynamic economic issues. In fact, the blade problem can be interpreted as an unstable fixed point in a dynamic system, which reveals some unsteady mechanism in economy and society itself. Keynes’s demand-management macroeconomic policy is to enter a stabilization mechanism for an unstable and dynamic economic system. If it is impossible to make an infinite substitution between capital and labor force, the labor market may be in an endless supply of surplus for a long period of time (even though the economic growth rate may be very high at this time and the economic and social labor costs may be low and the economy and society may already have Using the most labor-intensive production methods). The macro-dynamics revealed by the Harold model closely approximate the reality of economic growth and volatility in developing countries. To some extent, this is also a portrayal of China’s economic growth and volatility in the past two decades or so.