Neo-classical liberals aim to offer a more consistent, coherent, and morally ambitious form of liberalism than the traditional classical and social liberal alternatives by providing grounds for a strong commitment to both individual economic liberty and social justice. The key neo-classical liberal claim is that the stringent protection of negative economic liberty does not conflict with, but is rather an essential component of, a commitment to political and social justice. My focus in this article is not on this key neo-classical (...) claim itself, but rather on the conceptually prior question of the meaning and institutional implications of the negative conception of individual economic liberty. In addressing this question I trace some lines of argument which derive from the classical political economy of the late eighteenth and early nineteenth centuries. Drawing in particular on ideas and arguments developed by the American economist and social critic Henry George, I argue that a fully coherent and defensible conception of negative economic liberty is compatible with a commitment to a strongly conditional form of private landownership, but is incompatible with a commitment to absolute private property in land. (shrink)