Twofold Multiprior Preferences and Failures of Contingent Reasoning

29 Dec 2020  ·  Federico Echenique, Masaki Miyashita, Yuta Nakamura, Luciano Pomatto, Jamie Vinson ·

We propose a model of incomplete \textit{twofold multiprior preferences}, in which an act $f$ is ranked above an act $g$ only when $f$ provides higher utility in a worst-case scenario than what $g$ provides in a best-case scenario. The model explains failures of contingent reasoning, captured through a weakening of the state-by-state monotonicity (or dominance) axiom. Our model gives rise to rich comparative statics results, as well as extension exercises, and connections to choice theory. We present an application to second-price auctions.

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