The AVE example highlights the two fundamental insights provided by Porter’s five forces framework. First, competition must be defined more broadly to go beyond direct industry competitors. In this case, rather than defining competition narrowly as the firm’s closest competitors, airline executives in Spain must look beyond other airlines and con- sider substitute offerings such as high-speed trains. Second, any of the five forces on its own, if sufficiently strong, can extract industry profitability. In the AVE example, the threat of substitutes is limiting the airline industry’s profit potential. With the arrival of the AVE, the airlines’ monopoly on fast transportation between Madrid and Barcelona vanished as did the airlines’ high profits. The strong threat of substitutes in this case increased the rivalry among existing competitors (in the airline industry), to which we now turn.