物性セミナー/2008-12-19

2008年 冬学期 第6回 物性セミナー

 講師 青木 正直 氏(UCLA名誉教授)

 題目 Non-self averaging phenomena in macroeconomics

 日時 2008年 12月 19日(金) 午後4時30分

 場所 16号館 827

アブストラクト

We explain that self-averaging taken for granted by economists is not　actually so robust　but holds true only for a limited class of models. When model is　non-self-averaging,　we cannot legitimately focus on the means. It, in turn, means that the　maximization　exercises done for the representative agent or a representative market　are meaningless. We also show how time-dependent macroeconomic response follows from microeconomic　dynamics using linear response theory and a time-correlation formalism. This theory provides a straightforward approach to time-dependent macroeconomic model construction that preserves the heterogeneity and complex dynamics of microeconomic agents. We illustrate this approach by examining the relationship between output and demand as mediated by changes in unemployment,　or Okun's law. We also demonstrate that time dependenceimplies overshooting and how this formalism leads to a natural definition ofeconomic friction.

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