Assume that the potato chip industry in the Northwest in 2007 was competitively structured and in long-run competitive equilibrium; firms were earning a normal rate of return, in 2008 two smart lawyers quietly bought up all the firms and began operations as a monopoly called "Wonks." To operate efficiently, Wonks hired a management consulting firm, which estimated long-run cost and demand. Can the horizontal sum of the marginal cost curves of the individual firms?