Collusion under imperfect monitoring is explored when firms' prices are private information and their quantities are public information; an information structure consistent with several recent price-fixing cartels such as those in lysine and vitamins. For a class of symmetric duopoly games, it...

Collusion remains a strong undercurrent of business practice despite anti-cartel enforcement being a top priority of competition authorities. Alongside active prosecution of cartels, the study of cartels is a vibrant area of research for economic and legal scholars. A challenge for both practice...