Rarely is intellectual property alone sufficient to block these rivals. Consider how many tablet computers appeared after the success of Apple’s iPad. As imitators enter the market, they create price pressures that can reduce the value that the original innovator captures. Moreover, if the suppliers, distributors, and other companies required to deliver an innovation are dominant enough, they may have sufficient bargaining power to capture most of the value from an innovation. Think about how most personal computer manufacturers were largely at the mercy of Intel and Microsoft.