Group contests of incomplete information

Date: 2014-09
By: Philip Brookins (Department of Economics, Florida State University)
Dmitry Ryvkin (Department of Economics, Florida State University)
URL: http://d.repec.org/n?u=RePEc:fsu:wpaper:wp2014_09_02&r=net
We prove the existence of monotone pure strategy Bayesian equilibria in two types of contests between groups under incomplete information: (i) individual-level private information group contests, where each player only knows her own ability, and (ii) group-level private information group contests, where each player knows the abilities of all members of her group. In the latter case, we also show that the equilibrium is unique. We provide the results of exploratory numerical computations and discuss the qualitative properties of the equilibria.
Keywords: contest, group, incomplete information
JEL: D72 C72 C02
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An experimental study of sorting in group contests

YNY: 這是一篇比較 group 之組成成員能力不同下, 所形成 overbidding 的實驗文獻。

Date: 2014-01
By: Philip Brookins (Department of Economics, Florida State University)
John Lightle (Department of Economics, Florida State University)
Dmitry Ryvkin (Department of Economics, Florida State University)
URL: http://d.repec.org/n?u=RePEc:fsu:wpaper:wp2014_01_01&r=net
We study experimentally the effects of sorting in contests between groups of heterogeneous players whose within-group efforts are perfect substitutes. The theory predicts that higher aggregate effort will be reached when variation in ability between groups is lower, i.e., by a more balanced sorting. In the experiment, we assign subjects to four types — A, B, C, and D — ranked by their cost of effort, with A having the lowest and D having the highest cost, and conduct contests between two groups of two players each. In the Balanced treatment, (A,D) groups (i.e., groups comprised of a type A and a type D player) compete with (B,C) groups, whereas in the Unbalanced treatment, (A,B) groups compete with (C,D) groups. We find substantial heterogeneity and overinvestment of efforts by all types in both treatments, including the “underdog" (C,D) group which surprisingly is not demoralized by the unbalanced matching. Despite strong overbidding, relative aggregate efforts are remarkably close to equilibrium predictions both between treatments and between groups within each treatment. The results confirm the prediction that balanced sorting leads to higher aggregate effort.
Keywords: contest, group, sorting, heterogeneous players, experiment
JEL: C72 C91 M54 D72