Auctioneers suspecting bidder collusion often lack the formal evidence needed for legal recourse. A practical … alternative is to design auctions that hinder collusion. Since Abreu et al. (1986), economic theory has emphasized imperfect … monitoring as a constraint on collusion, but evidence remains scarce on whether: (i) information frictions meaningfully limit …

to collusion. Using an explicit measure of labor market collusion from unsealed court evidence, we find that the … probability of collusion between two firms increases by 12 percentage points after the onset of common leadership, compared to a …