Earning and Utility Limits in Fisher Markets
Earning and Utility Limits in Fisher Markets
复制标题
渔市的收入和效用限制
DOI:
10.1145/3340234
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发表时间:
2019
影响因子:
1.2
通讯作者:
Mehlhorn, Kurt
中科院分区:
文献类型:
--
作者:
Bei, Xiaohui;Garg, Jugal;Hoefer, Martin;Mehlhorn, Kurt
Earning limits and utility limits are novel aspects in the classic Fisher market model. Sellers with earning limits have bounds on their income and lower the supply they bring to the market if income exceeds the limit. Buyers with utility limits have an upper bound on the amount of utility that they want to derive and lower the budget they bring to the market if utility exceeds the limit. Markets with these properties can have multiple equilibria with different characteristics.We analyze earning limits and utility limits in markets with linear and spending-constraint utilities. For markets with earning limits and spending-constraint utilities, we show that equilibrium price vectors form a lattice and the spending of buyers is unique in non-degenerate markets. We provide a scaling-based algorithm to compute an equilibrium in timeO(n3ℓ log (ℓ +nU)), wherenis the number of agents, ℓ ≥na bound on the segments in the utility functions, andUthe largest integer in the market representation. We show how to refine any equilibrium in polynomial time to one with minimal prices or one with maximal prices (if it exists). Moreover, our algorithm can be used to obtain in polynomial time a 2-approximation for maximizing Nash social welfare in multi-unit markets with indivisible items that come in multiple copies.For markets with utility limits and linear utilities, we show similar results—lattice structure of price vectors, uniqueness of allocation in non-degenerate markets, and polynomial-time refinement procedures to obtain equilibria with minimal and maximal prices. We complement these positive results with hardness results for related computational questions. We prove that it is NP-hard to compute a market equilibrium that maximizes social welfare, and it is PPAD-hard to find any market equilibrium with utility functions with separate satiation points for each buyer and each good.
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DOI:
--
发表时间:
2015
期刊:
ACM-SIAM Symposium on Discrete Algorithms
影响因子:
--
作者:
Nikhil R. Devanur;J. Garg;R. Mehta;V. Vazirani;Sadra Yazdanbod
通讯作者:
Sadra Yazdanbod
DOI:
--
发表时间:
2008
期刊:
Symposium on the Theory of Computing
影响因子:
--
作者:
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通讯作者:
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DOI:
--
发表时间:
2011
期刊:
Symposium on the Theory of Computing
影响因子:
--
作者:
László A. Végh
通讯作者:
László A. Végh
DOI:
10.1016/j.geb.2008.11.011
发表时间:
2010
期刊:
Games Econ. Behav.
影响因子:
--
作者:
K. Jain;V. Vazirani
通讯作者:
V. Vazirani
DOI:
10.1287/moor.1110.0517
发表时间:
2011
期刊:
Math. Oper. Res.
影响因子:
--
作者:
G. Goel;V. Vazirani
通讯作者:
V. Vazirani