On Viable Diffusion Price Processes of the Market Portfolio

  • Author(s): AVI BICK
  • Published: Apr 30, 2012
  • Pages: 673-689
  • DOI: 10.1111/j.1540-6261.1990.tb03711.x

ABSTRACT

The assumption that the market portfolio follows a specified diffusion process implies, in a simple equilibrium framework, that the representative individual must have a certain utility function which is identified in the paper. Not every diffusion process is viable, i.e., can be “endogenized” to be the market portfolio's price process in such an equilibrium model. The paper provides necessary and sufficient conditions for viability which imply that viable diffusion processes constitute a rather restricted family.

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