When a new firm enters a market and starts selling a spatially-differentiated product, the prices of existing products may rise due to a better match between consumers and products. Entry may have three unusual effects. First, the new price is above the monopoly price if the two firms collude...

We study the events alleged in recent Norwegian salmon industry antitrust cases to explore the relationship between vertical integration and collusion. In particular, we are interested in whether vertical integration can facilitate the strategic use of coordination devices such as public price...