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STICERD Economic Theory Seminars

Dominance and Optimality

Tilman Börgers (Michigan), joint with Xienan Cheng

Thursday 20 October 2022 15:30 - 17:00

This event is both online and in person

32L 3.05, 3rd Floor Conference Room, LSE, 32 Lincoln's Inn Fields, London WC2A 3PH

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About this event

This paper proposes a general theory of dominance among choices that encompasses strict and weak dominance among strategies in games, Blackwell dominance among experiments, and first or second order stochastic dominance among monetary lotteries. One choice dominates another if in a variety of situations the former choice yields higher expected utility than the latter. We then investigate whether, in a finite set of possible choices, all undominated choices are optimal in some situation. We present a formal framework in which the answer to this question is positive, and we show that within this framework the set of undominated choices is the smallest set to which the decision maker can restrict attention ex ante without running the risk of not having an optimal choice in the particular situation in which she finds herself. For this result it is crucial that the dominating alternatives are allowed to be convex combinations (in games: mixed strategies). A detailed analysis of dominance in game theory, Blackwell dominance, and first or second order stochastic dominance in one common framework also allows us to compare the properties of these concepts, and to obtain insights into why certain versions of our result apply only to some, but not all of these concepts.

Economic Theory Seminars are held on Thursdays in term time at 15:30-17:00, both ONLINE and IN PERSON in 32L 3.05.

Seminar organisers: Dr Andrew Ellis and Dr Christopher Sandmann.

For further information please contact Annie-Rose Nicholas by email: a.nicholas1@lse.ac.uk.

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This event will take place in 32L 3.05, 3rd Floor Conference Room, LSE, 32 Lincoln's Inn Fields, London WC2A 3PH.

The building is labelled 32L on the map. Enter the building via Lincoln's Inn Fields.

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