Long-Run Risk is the Worst-Case Scenario: Ambiguity Aversion and Non-Parametric Estimation of the Endowment Process

Rhys Bidder and Ian Dew-Becker

No 2014-16, Working Paper Series from Federal Reserve Bank of San Francisco

Abstract: We study an agent who is unsure of the dynamics of consumption growth. She estimates her consumption process non-parametrically to place minimal restrictions on dynamics. We analytically show that the worst-case model that she uses for pricing, given a penalty on deviations from the point estimate, is a model with long-run risks. This result cannot in general be matched in a fixed model with only parameter uncertainty. With a single parameter determining risk preferences, the model generates high and volatile risk premia and matches R2s from return forecasting regressions, even though risk aversion is equal to 5.3 and the worst-case dynamics are statistically nearly indistinguishable from the true model.

Pages: 59 pages
Date: 2014-05
New Economics Papers: this item is included in nep-upt
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DOI: 10.24148/wp2014-16

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