This paper investigates whether a contest organizer should disclose private information about bidders’ abilities in a multi-prize all-pay auction. Bidders’ abilities are randomly distributed and observed by the contest organizer; the organizer decides whether to disclose this information...

In a standard noisy contest, more competition (more contestants) leads to lower individual equilibrium effort. We show that when contestants can make pre-contest investment to enhance their competency, neither equilibrium investment nor individual effort is monotonic in the number of...