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Heterogeneity in stock prices: A STAR model with multivariate transition function

Lof, Matthijs (2010): Heterogeneity in stock prices: A STAR model with multivariate transition function.

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Abstract

This paper applies a heterogeneous agent asset pricing model, featuring fundamentalists and chartists, to the price-dividend and price-earnings ratios of the S&P500 index. Agents update their beliefs according to macroeconomic information, as an alternative to evolutionary dynamics. For estimation, a STAR model is introduced, with a transition function depending on multiple transition variables. A procedure based on linearity testing is proposed to select the appropriate linear combination of transition variables. The results show that during periods of favorable economic conditions the fraction of chartists increases, causing stock prices to decouple from fundamentals.

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