Glad to see someone repping van Parijs on HN... while we're at it, I feel like I should recommend his longer and more systematic treatment of the subject, "Real Freedom For All" ( http://www.amazon.com/Real-Freedom-All-capitalism-Political/... ). Parts of it are sort of obtusely written (he spends a lot of time responding to other thinkers, e.g. Marx and Rawls, along the way), but there are good arguments scattered throughout.