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A Model of Keynesian under Knightian Uncertainty

  • Shin-ichi Fukuda

    (Faculty of Economics, University of Tokyo)

The purpose of this paper is to explore a source of nominal price rigidity and non-neutrality of money in a model of monopolistic competition under Knightian uncertainty. The decision-making theory in the analysis is that of expected utility under a nonadditive probability measure, that is, the Choquet expected utility model of preference. We apply this decision theory to a model of monopolistic competition without fixed cost of price adjustment. We show that when aversion to Knightian uncertainty exists, nominal price becomes rigid in a model of monopolistic competition. The model therefore has a Keynesian feature that nominal disturbances, particularly anticipated changes of money supply, have real effects on aggregate output fluctuations. The feature holds even if aversion to Knightian uncertainty is very small.

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File URL: http://www.cirje.e.u-tokyo.ac.jp/research/dp/2001/2001cf115.pdf
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Paper provided by CIRJE, Faculty of Economics, University of Tokyo in its series CIRJE F-Series with number CIRJE-F-115.

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Length: 26 pages
Date of creation: May 2001
Date of revision:
Handle: RePEc:tky:fseres:2001cf115
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  1. Joshua Aizenman, 1995. "Investment in New Activities and the Welfare Cost of Uncertainty," NBER Working Papers 5041, National Bureau of Economic Research, Inc.
  2. Ozaki, Hiroyuki & Streufert, Peter A., 1996. "Dynamic programming for non-additive stochastic objectives," Journal of Mathematical Economics, Elsevier, vol. 25(4), pages 391-442.
  3. Anil K Kashyap, 1994. "Sticky Prices: New Evidence from Retail Catalogs," NBER Working Papers 4855, National Bureau of Economic Research, Inc.
  4. Gerd Weinrich, 1997. "Endogenous fixprices and sticky price adjustment of risk-averse firms," Journal of Economics, Springer, vol. 66(3), pages 283-305, October.
  5. Camerer, Colin & Weber, Martin, 1992. " Recent Developments in Modeling Preferences: Uncertainty and Ambiguity," Journal of Risk and Uncertainty, Springer, vol. 5(4), pages 325-70, October.
  6. Gilboa, Itzhak & Schmeidler, David, 1989. "Maxmin expected utility with non-unique prior," Journal of Mathematical Economics, Elsevier, vol. 18(2), pages 141-153, April.
  7. Gilboa, Itzhak, 1987. "Expected utility with purely subjective non-additive probabilities," Journal of Mathematical Economics, Elsevier, vol. 16(1), pages 65-88, February.
  8. Schmeidler, David, 1989. "Subjective Probability and Expected Utility without Additivity," Econometrica, Econometric Society, vol. 57(3), pages 571-87, May.
  9. Mankiw, N Gregory, 1985. "Small Menu Costs and Large Business Cycles: A Macroeconomic Model," The Quarterly Journal of Economics, MIT Press, vol. 100(2), pages 529-38, May.
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