Single unit auctions; still enigmatic
Michael Landsberger, Boris Tsirelson,
"Single unit auctions; still enigmatic."
Available online (free of charge) from Social Science Research Network:
A research preprint, 27 pages, 8 figures, bibl. 15 refs.
We consider the well-known model proposed by Milgrom and Weber in 1982, where players are risk neutral, their valuations V1,...,Vn are neither private nor common, they depend on privately observed signals X1,...,Xn and a common, unobservable, random variable S (possibly, multidimensional). We prove that if
the existing results for single unit auctions are not valid anymore, in many cases. In fact, it is not known how many equilibria (if any) exist in such auctions, and how to define (construct, select) the relevant equilibrium. The reason is that in many cases if an equilibrium exists, it can not be supported by monotone (threshold) participation strategies. The driving force of this result is the dual meaning of interdependent signals. When signals are independent, a higher signal is good news. Under dependence, in a monotone equilibrium, a higher signal is both, good and bad news.
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