The authors give TIE mechanisms that guarantee 1/(H_n + 2)-MMS ex-post (nearly optimal for ordinal), Omega(1/log log n) with some cardinal data, and 2/3-MMS for two agents, all ex-ante proportional and polynomial-time.
Importantly, for every itemeit holds thatv ′ 2(e)≥v 2(e)
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Truthful-in-Expectation Mechanisms for MMS Approximation
The authors give TIE mechanisms that guarantee 1/(H_n + 2)-MMS ex-post (nearly optimal for ordinal), Omega(1/log log n) with some cardinal data, and 2/3-MMS for two agents, all ex-ante proportional and polynomial-time.