Crowdsourcing platforms typically take a passive approach and let solvers self-select which (if any) of the concurrently running contests they wish to participate into. Thus, firms which set prizes and organize contests on these platforms are competing among themselves (for solver participation...

This paper derives Bayesian equilibria under general conditions for a broad family of sealed-bid combinatorial auction formats under incomplete information. Equilibria are constructed by linking an equilibrium of the combinatorial auction format to an equilibrium of its single-unit version,...

The symmetric two-player Hirshleifer (1989) contest is shown to admit a unique equilibrium. The support of the equilibrium strategy is finite and includes, in particular, the zero expenditure level. We also establish a lower bound for the cardinality of the support and an upper bound for the...