itable. Rather, it is because those companies were overtaken by competitors. They had failed to adapt, and failed to redefine the core. Even some of the longest-lasting markets, from oil production to home building to automobiles to clothing, contain a range of companies—some highly profitable and some highly unprofitable. One analysis that we conducted found that only about 20 percent of the variation in profitability levels among companies related to the specific choice of market that they participated in, leaving 80 percent for company-specific factors such as performance relative to their competitors