Optimization with demand oracles

Ashwinkumar Badanidiyuru, Shahar Dobzinski, Sigal Oren

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

We study combinatorial procurement auctions, where a buyer with a valuation function v and budget B wishes to buy a set of items. Each item i has a cost c i and the buyer is interested in a set S that maximizes v(S) subject to Σ i∈S ci ≤ B. Special cases of combinatorial procurement auctions are well-studied problems from submodular optimization. In particular, when the costs are all equal (cardinality constraint), a classic result by Nemhauser et al shows that the greedy algorithm provides an e/e-1 approximation. Motivated by many papers that utilize demand queries to elicit the preferences of agents in economic settings, we develop algorithms that guarantee improved approximation ratios in the presence of demand oracles. We are able to break the e/e-1 barrier: we present algorithms that use only polynomially many demand queries and have approximation ratios of 9/8 + ε for the general problem and 9/8 for maximization subject to a cardinality constraint. We also consider the more general class of subadditive valuations. We present algorithms that obtain an approximation ratio of 2 + ε for the general problem and 2 for maximization subject to a cardinality constraint. We guarantee these approximation ratios even when the valuations are non-monotone. We show that these ratios are essentially optimal, in the sense that for any constant ε > 0, obtaining an approximation ratio of 2 - ε requires exponentially many demand queries.

Original languageEnglish
Title of host publicationEC '12 - Proceedings of the 13th ACM Conference on Electronic Commerce
Pages110-127
Number of pages18
DOIs
StatePublished - 10 Jul 2012
Externally publishedYes
Event13th ACM Conference on Electronic Commerce, EC '12 - Valencia, Spain
Duration: 4 Jun 20128 Jun 2012

Conference

Conference13th ACM Conference on Electronic Commerce, EC '12
Country/TerritorySpain
CityValencia
Period4/06/128/06/12

Keywords

  • procurement auctions

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