Based on 18 country reviews performed over the 2003-2005 period, this paper examines, the cross-country differences in policy approaches to product market competition and their consequences for product market rents. Against this background, the paper summarises OECD recommendations to further strengthen competition in various sectors and areas. These include: removing remaining barriers to trade and inward foreign direct investments; better securing deterrence of cartels through effective sanctions; facilitate market access to inherently competitive industries by easing zoning laws (the retail sector), abolishing reserved monopolies (sales of tobacco and alcohol), limiting the scope of trade associations’ self-regulation and easing residency or nationality requirements (professional services); meet competition challenges in network industries by facilitating the effective separation of monopoly components from competitive activities, reducing public ownership, clearly separating the government’s ownership and regulatory functions and creating the right incentives for investing in infrastructures.