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Bidding Games and Efficient Allocations

Published: 15 June 2015 Publication History

Abstract

Bidding games are extensive form games, where in each turn players bid in order to determine who will play next. Zero-sum bidding games (also known as Richman games) have been extensively studied, focusing on the fraction of the initial budget that can guaranty the victory of each player [Lazarus et al.'99, Develin & Payne '10].
We extend the theory of bidding games to general-sum two player games, showing the existence of pure subgame-perfect Nash equilibria (PSPE), and studying their properties under various initial budgets.
We show that if the underlying game has the form of a binary tree (only two actions available to the players in each node), then there exists a natural PSPE with the following highly desirable properties: (a) players' utility is weakly monotone in their budget; (b) a Pareto-efficient outcome is reached for any initial budget; and (c) for any Pareto-efficient outcome there is an initial budget s.t. this outcome is attained. In particular, we can assign the budget so as to implement the outcome with maximum social welfare, maximum Egalitarian welfare, etc.
We show implications of this result for various games and mechanism design problems, including Centipede games, voting games, and combinatorial bargaining. For the latter, we further show that the PSPE above is fair, in the sense that an player with a fraction of $X\%$ of the total budget prefers her allocation to X% of the possible allocations.

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cover image ACM Conferences
EC '15: Proceedings of the Sixteenth ACM Conference on Economics and Computation
June 2015
852 pages
ISBN:9781450334105
DOI:10.1145/2764468
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 15 June 2015

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Author Tags

  1. bidding games
  2. scrip money
  3. sequential bargaining

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EC '15
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EC '15: ACM Conference on Economics and Computation
June 15 - 19, 2015
Oregon, Portland, USA

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EC '15 Paper Acceptance Rate 72 of 220 submissions, 33%;
Overall Acceptance Rate 664 of 2,389 submissions, 28%

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