通过加总推出的总供给曲线

On the Derivation of Aggregate Supply Curve by Integration

总供给曲线的推导是宏观经济学中的最重要内容之一。在大多数宏观经济模型中 ,在推导总供给曲线时 ,加总问题 (aggregationproblem)往往被忽略。一般认为 ,总供给曲线是各企业供给曲线的简单算术和或是一个代表性企业供给曲线的简单放大。但是 ,在现实中 ,各个企业是不同的。只有在非常严格的条件下 ,总供给曲线与企业供给曲线在性质上才是等价的。考虑到中国经济的制度性特点并在解决加总的一系列技术问题的基础上 ,本文推导出了在企业劳动生产率服从均匀分布情况下的总供给曲线。通过这种方法推出的总供给曲线具有许多传统总供给曲线所不具有的新性质。笔者希望本文能为进一步研究处于微观经济和宏观经济之间的往往被忽视的一块重要领域 (“中观经济领域”)做出贡献。

The derivation of aggregate supply curve is one of the most important parts of macroeconomics. In most macroeconomic models, in deriving the aggregate supply curve, aggregation problem is not dealt with explicitly. It is assumed that aggregate supply is simply a summation of supplies by individual enterprises or a multiplication of the supply of output by the representative enterprise. However, in reality,each enterprise is different. Only under strict conditions, can the behavior of the representative firm be used to represent the aggregate behavior of the economy as a whole. Taking into consideration China's institutional characteristics and dealing with aggregation problem explicitly, the paper developed a method to derive aggregate supply curve by assuming enterprises in the economy follow certain statistic distribution in terms of labor productivity and then integrating outputs of all enterprises at each price level. The aggregate supply curve thus derived posses many new characteristics not included in traditional aggregate supply curves. It is hoped that the paper may contribute to the study of a relatively untouched but very important area that lies between microeconomic foundation and macroeconomic superstructure.