I present a dilemma for the market failures approach to business ethics. On an orthodox interpretation, it takes moral requirements for businesses to require them not to profit from market failures to approximate Pareto efficiency. On a moralized interpretation, it also incorporates other considerations. However, the orthodox approach is extensionally inadequate, for it is legitimate to profit from many of the allegedly ruled-out market failures. The moralized approach does better but fails to be sufficiently comprehensive. First, it has not been (...) shown why we ought to adhere to any particular limited subset of norms of and for the market. Second, we have a very general reason to mitigate the moral horror of the world, which indicates that the market failures approach is too arbitrarily restricted. (shrink)