Weyerhaeuser and the Search for Antitrust\u27s Holy Grail

A general definition of exclusionary conduct has become a sort of Holy Grail for antitrust scholars. At present, four proposed definitions appear most promising: (1) conduct that could exclude an equally efficient rival; (2) conduct that raises rivals\u27 costs unjustifiably; (3) conduct that, on balance, impairs consumer welfare by creating market power without providing countervailing consumer benefits; and (4) conduct that makes no economic sense but for its exclusionary effect on rivals