this is worth thinking about more because this justification--the question of incentive--seems to underpin his entire economic worldview (and he's not alone). the problem is that he never really explores the full ramifications of an abundance of labour & how that could affect the idea of incentive. like what is the incentive supposed to be, really? the possibility of buying more luxury goods or getting people to do things for you? why do we take it as natural that the economic motive is the only acceptable incentive without considering what that actually means?