  Accounts of responsibility or desert affect how much luck there is in the world. If, on the one hand, one accepts a hard deterministic account of responsibility, everything is a matter of responsibility luck. A hard deterministic account of responsibility says that responsibility and determinism are incompatible, that determinism is true, and, hence, that no one is ever responsible for anything. Most believe that, if hard determinism is true, extensionally speaking, luck-egalitarianism collapses into straight equality of outcome (e.g., Smilansky 1997, 156; but see Stemplowska 2008). If, on the other hand, one accepts a compatibilist, reason responsiveness account of responsibility, many outcomes will not be a matter of responsibility luck, at least for some agents. A compatibilist, reason responsiveness account of responsibility for outcomes says that an agent is responsible for outcomes that he or she brings about in the right sort of way through the agent’s actions (or omissions) where these issue from an action-generating process that is sufficiently sensitive to practical reasons, e.g., normal human deliberation, and that actions may issue from such mechanisms whether or not determinism obtains (Fischer and Ravizza 1998). Still, agents who act from reason responsive mechanisms may face choice situations that differ much in terms of how favorable they are in which case inequalities reflecting such differences may not be just, even if they obtain between agents who are responsible for the choices they made. For this reason (among others), it is open for compatibilist luck-egalitarians to think that little inequality can be justified by differential exercises of choice (see Barry 2005).