对经济学模型化的批判:结论隐藏在基本前提假设中——从一个效用函数导致不同的结果分析经济学模型化中的问题

经济理论与经济管理 ›› 2010, Vol. ›› Issue (1): 38-44.

对经济学模型化的批判:结论隐藏在基本前提假设中——从一个效用函数导致不同的结果分析经济学模型化中的问题

张延

北京大学经济学院, 北京, 100871

收稿日期:2009-10-18 出版日期:2010-01-16 发布日期:2012-03-01

A CRITIQUE ON ECONOMIC MODELING:CONCLUSIONS LOGICALLY IMPLIED IN THE BASIC ASSUMPTIONS——A View on the Problems in the Process of Economic Modeling from the Truth that Different Results Are Induced by the Same Utility Function

ZHANG Yan

School of Economics, Peking University, Beijing 100871, China

Received:2009-10-18 Online:2010-01-16 Published:2012-03-01

摘要/Abstract

摘要： 本文通过戴维·罗默《高级宏观经济学》教科书的一个效用函数在三个经典模型——无限期界拉姆齐模型、戴蒙德世代交叠模型和真实经济周期模型中导致的不同结果,发现结果不同的关键原因在于基本前提假设的微小差异。说明经济学模型化的实质——结论隐藏在基本前提假设中。换句话说,数学推导是走过场,是一种精致的包装。前提假设决定结论。

关键词: CRRA效用函数, 无限期界拉姆齐模型, 戴蒙德世代交叠模型, 真实经济周期模型

Abstract: Through the study on the different results in the three classical models introduced in the book Advanced Macroeconomics——infinite horizon Ramsey Model, Overlapping Generation Diamond Model and Real Business Cycle Model_——induced from the same utility function, this paper reveals that the key of result differences lie in the delicate variations of the basic assumptions, which shows that the essentiality of economic modeling is that the conclusions are logically implied in the basic assumptions. In other words, mathematical deduction is only a routine, or a delicate embellishment. The assumptions essentially decide the conclusions.

Key words: CRRA utility function, infinite horizon ramsey model, overlapping generation diamond model, real business cycle model

中图分类号:

F015

张延. 对经济学模型化的批判:结论隐藏在基本前提假设中——从一个效用函数导致不同的结果分析经济学模型化中的问题[J]. 经济理论与经济管理, 2010, (1): 38-44.

ZHANG Yan. A CRITIQUE ON ECONOMIC MODELING:CONCLUSIONS LOGICALLY IMPLIED IN THE BASIC ASSUMPTIONS——A View on the Problems in the Process of Economic Modeling from the Truth that Different Results Are Induced by the Same Utility Function[J]. Economic Theory and Business Management, 2010, (1): 38-44.