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The Evolutionary Stability of Optimism, Pessimism and Complete Ignorance

  • Burkhard C. Schipper

    ()

We provide an evolutionary foundation to evidence that in some situations humans maintain optimistic or pessimistic attitudes towards uncertainty and are ignorant to relevant aspects of the environment. Players in strategic games face Knightian uncertainty about opponents' actions and maximize individually their Choquet expected utility. Our Choquet expected utility model allows for both an optimistic or pessimistic attitude towards uncertainty as well as ignorance to strategic dependencies. An optimist (resp. pessimist) overweights good (resp. bad) outcomes. A complete ignorant never reacts to opponents' change of actions. With qualifications we show that optimistic (resp. pessimistic) complete ignorance is evolutionary stable / yields a strategic advantage in submodular (resp. supermodular) games with aggregate externalities. Moreover, this evolutionary stable preference leads to Walrasian behavior in those classes of games.

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Paper provided by University of Bonn, Germany in its series Bonn Econ Discussion Papers with number bgse35_2005.

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Length: 32
Date of creation: Nov 2005
Date of revision:
Handle: RePEc:bon:bonedp:bgse35_2005
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Web page: http://www.bgse.uni-bonn.de

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