Name any industry and more likely than not you will find that the three strongest, most efficient companies control 70 to 90 percent of the market. Here are just a few examples:
McDonald's, Burger King, and Wendy's
General Mills, Kellogg, and Post
Nike, Adidas, and Reebok
Bank of America, Chase Manhattan, and Banc One
American, United, and Delta
Merck, Johnson & Johnson, and Bristol-Myers Squibb
Based on extensive studies of market forces, the distinguished business school...