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A short note on the problematic concept of excess demand in asset pricing models with mean-variance optimization

By Reiner Franke

Abstract

Referring to asset pricing models where demand is proportional to excess returns and said to be derived from a mean-variance optimization problem, the note formulates what probably is common knowledge but hardly ever made an explicit subject of discussion. This is an insufficient distinction between the desired holding of the risky asset on the part of the speculative agents, which is the solution to the optimization problem and usually directly presented as excess demand, and the desired change in this holding, which is what should reasonably constitute the excess demand on the market. The note arrives at the conclusion that in models with a market maker the story of the maximization of expected wealth should be dropped

Topics: HB
Publisher: Warwick Business School, Financial Econometrics Research Centre
Year: 2008
OAI identifier: oai:wrap.warwick.ac.uk:1728

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