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A Jump/Diffusion Consumption‐Based Capital Asset Pricing Model and the Equity Premium Puzzle
Author(s) -
Aase Knut K.
Publication year - 1993
Publication title -
mathematical finance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.98
H-Index - 81
eISSN - 1467-9965
pISSN - 0960-1627
DOI - 10.1111/j.1467-9965.1993.tb00079.x
Subject(s) - economics , capital asset pricing model , jump diffusion , econometrics , consumption (sociology) , risk premium , consumption based capital asset pricing model , equity premium puzzle , jump , financial economics , asset (computer security) , interest rate , equity (law) , monetary economics , social science , physics , computer security , quantum mechanics , sociology , computer science , law , political science
This paper derives the equilibrium excess returns on risky assets in an exchange economy where the underlying exogenous uncertainty is a combination of a pure multidimensional jump process and a diffusion model. We derive closed‐form solutions for the interest rate and the risk premiums on risky assets for a traditional class of separable utility indices. Our analysis demonstrates that when the underlying jumps of the aggregate consumption process are not negligible, then the traditional form of the consumption‐based capital asset princing model need not hold and the asset risk premiums may be larger than predicted by the traditional CCAPM in continuous time, based on pure Itô diffusion processes. Our analysis suggests an explanation for the large estimates of the risk premiums reported in empirical tests of the single‐beta CCAPM.