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Stability and Efficiency in Decentralized Two-Sided Markets with Weak Preferences

Radoslav Raykov

Staff Working Papers from Bank of Canada

Abstract: Many decentralized markets are able to attain a stable outcome despite the absence of a central authority (Roth and Vande Vate, 1990). A stable matching, however, need not be efficient if preferences are weak. This raises the question whether a decentralized market with weak preferences can attain Pareto efficiency in the absence of a central matchmaker. I show that when agent tastes are independent, the random stable match in a large-enough market is asymptotically Pareto efficient even with weak preferences. In fact, even moderate-sized markets can attain good efficiency levels. The average fraction of agents who can Pareto improve is below 10% in a market of size n = 79 when one side of the market has weak preferences; when both sides have weak preferences, the inefficiency falls below 10% for n > 158. This implies that approximate Pareto efficiency is attainable in a decentralized market even in the absence of a central matchmaker.

Keywords: Economic; models (search for similar items in EconPapers)
JEL-codes: C78 D61 (search for similar items in EconPapers)
Pages: 41 pages
Date: 2017
New Economics Papers: this item is included in nep-gth
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