Boyer presents a compelling account of ownership as the outcome of interaction between two evolved cognitive systems. We integrate this model into current discussions of moral pluralism, suggesting that ownership meets the criteria to be a moral foundation. We caution against ignoring cultural variation in ownership norms and against explaining complex, contested moral phenomena using a monist approach.

This account of puritanical morality is useful and innovative, but makes two errors. First, it mischaracterizes the purity foundation as being unrelated to cooperation. Second, it makes the leap from cooperation (broadly construed) to a monist account of moral cognition (as harm or fairness). We show how this leap is both conceptually incoherent and inconsistent with empirical evidence about self-control moralization.