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Ambiguity Aversion and Absence of Trade

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  • Alain Chateauneuf
  • Luciano De Castro

Abstract

What is the effect of ambiguity aversion on trade? Although in a Bewley's model ambiguity aversion always lead to less trade, in other models this is not always true. However, we show that if the endowments are unambiguous then more ambiguity aversion implies less trade, for a very general class of preferences. The reduction in trade caused by ambiguity aversion can be as severe as to lead to no-trade. In an economy with MEU decision makers, we show that if the aggregate endowment is unanimously unambiguous then every Pareto optima allocation is also unambiguous. We also characterize the situation in which every unanimously unambiguous allocation is Pareto optimal. Finally, we show how our results can be used to explain the home-bias effect. As a useful result for our methods, we also obtain an additivity theorem for CEU and MEU decision makers that does not require comonotonicity JEL Code: D51, D6, D8

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Paper provided by Northwestern University, Center for Mathematical Studies in Economics and Management Science in its series Discussion Papers with number 1535.

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Date of creation: 01 Apr 2011
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Handle: RePEc:nwu:cmsems:1535

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Keywords: no-trade results; ambiguity aversion; Pareto optimality.;

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Citations

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Cited by:
  1. Tatjana Chudjakow & Frank Riedel, 2013. "The best choice problem under ambiguity," Economic Theory, Springer, vol. 54(1), pages 77-97, September.
  2. José Faro, 2013. "Cobb-Douglas preferences under uncertainty," Economic Theory, Springer, vol. 54(2), pages 273-285, October.
  3. Lombardi Michele & Yoshihara Naoki, 2010. "A Full Characterization of Nash Implementation with Strategy Space Reduction," Research Memorandum 023, Maastricht University, Maastricht Research School of Economics of Technology and Organization (METEOR).
  4. Tamini, Lota Dabio, 2012. "Optimal quality choice under uncertainty on market development," Working Papers 148589, Structure and Performance of Agriculture and Agri-products Industry (SPAA).
  5. M. Peiris & Alexandros Vardoulakis, 2013. "Savings and default," Economic Theory, Springer, vol. 54(1), pages 153-180, September.
  6. Patrick Beißner, 2013. "Radner equilibria under ambiguous volatility," Working Papers 493, Bielefeld University, Center for Mathematical Economics.
  7. Tamini, Lota D., 2012. "Optimal quality choice under uncertainty on market development," MPRA Paper 40845, University Library of Munich, Germany.

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