Do Sunspots Matter under Complete Ignorance?

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dc.contributor.author GIORDANI, Paolo
dc.contributor.author COZZI, Guido
dc.date.accessioned 2007-10-23T12:07:28Z
dc.date.available 2007-10-23T12:07:28Z
dc.date.issued 2006
dc.identifier.citation Research in Economics, 2006, 60, 3, 148-154 en
dc.identifier.uri http://hdl.handle.net/1814/7225
dc.description.abstract In a two-period, sunspot, pure-exchange economy we analyse the case in which agents do not assign subjective probabilistic beliefs to the ‘sunspot activity’. Two generations, each of which is made up of identical agents, populate this economy. Participation in the Arrow securities market is restricted and the generation, which is allowed to trade in assets, can alternatively face uncertainty via two distribution-free decision rules under ‘complete ignorance’ (axiomatized by Milnor [Milnor, J., 1954. Games against nature. In: Thrall, R. Coombs, C., Davis, R. (Eds.), Decision Processes. John Wiley, London, pp. 49–60]): the ‘minimax regret criterion’ [Savage, L.J., 1954. The Foundations of Statistics. Wiley, New York, ch. 9] and the ‘maxmin return criterion’ [Wald, A., 1950. Statistical Decision Functions. Wiley, New York]. When the former is used, then sunspots can matter. In particular, we prove that, if the economy admits two Walrasian equilibria, then a unique sunspot equilibrium always exists. We pin down this equilibrium, determine the prices of the Arrow securities and show that, at these prices, no trade in securities takes place. In the same framework we prove that, with agents using the maxmin return criterion, sunspots do not matter. en
dc.title Do Sunspots Matter under Complete Ignorance? en
dc.type Article en
dc.neeo.contributor GIORDANI|Paolo|aut|
dc.neeo.contributor COZZI|Guido|aut|


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