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Market Prices of Risk with Diverse Beliefs, Learning, and Catastrophes


  • Timothy Cogley
  • Thomas J. Sargent
  • Viktor Tsyrennikov


We compare market prices of risk in economies with identical patterns of endowments, priors, and information flows, but two different market structures, one with complete markets, another in which consumers can trade only a single risk-free bond. We study how opportunities to speculate, uncommon priors, and learning affect market prices of risk. Two types of consumers have diverse beliefs about the law of motion for a random exogenous endowment. One type knows the true law of motion while the other type learns about it via Bayes' theorem. Less-well-informed consumers are pessimistic, initially overestimating the probability of a catastrophic state. Learning dynamics and the wealth dynamics that they drive contribute to differences in evolutions of market prices of risk across market structures.

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  • Timothy Cogley & Thomas J. Sargent & Viktor Tsyrennikov, 2012. "Market Prices of Risk with Diverse Beliefs, Learning, and Catastrophes," American Economic Review, American Economic Association, vol. 102(3), pages 141-146, May.
  • Handle: RePEc:aea:aecrev:v:102:y:2012:i:3:p:141-46

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    References listed on IDEAS

    1. Lawrence Blume & David Easley, 2006. "If You're so Smart, why Aren't You Rich? Belief Selection in Complete and Incomplete Markets," Econometrica, Econometric Society, vol. 74(4), pages 929-966, July.
    2. Robert J. Barro, 2006. "Rare Disasters and Asset Markets in the Twentieth Century," The Quarterly Journal of Economics, Oxford University Press, vol. 121(3), pages 823-866.
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    Cited by:

    1. Nakov, Anton & Nuño, Galo, 2015. "Learning from experience in the stock market," Journal of Economic Dynamics and Control, Elsevier, vol. 52(C), pages 224-239.
    2. Athreya, Kartik B., 2014. "Big Ideas in Macroeconomics: A Nontechnical View," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262019736, July.

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