A Model of Keynesian under Knightian Uncertainty

Shin-ichi Fukuda ()

No CIRJE-F-115, CIRJE F-Series from CIRJE, Faculty of Economics, University of Tokyo

Abstract: 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.

Pages: 26 pages
Date: 2001-05
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Persistent link: https://EconPapers.repec.org/RePEc:tky:fseres:2001cf115

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