While moral arguments for limiting market expansionism proliferate, a fundamental question has been left unanswered: the moral limits of what, exactly? Moral Limits of Markets (MLM) theorists tend to employ different terms – markets, putting a price tag, buying and selling – interchangeably and inconsistently to describe the phenomenon they are troubled by. I clarify this ambiguity by offering a novel taxonomy of different dimensions of exchange I identify as the sources of the normative concerns of most MLM arguments: Alienation, (...) Commodification, Marketization, Privatization. This taxonomy allows us to better understand why and what about ‘markets’ should be limited. (shrink)