Moral philosophy today is marked by profound, systematic disagreement. In Rightness as Fairness, Marcus Arvan argues that moral philosophy must adapt scientific principles of theory-selection in order to reliably uncover moral truth. Arvan then argues that our best empirical evidence and naturalistic observation reveal morality to be a type of prudence requiring us to act in ways that our present and future selves can rationally agree upon across time. Arvan shows that this agreement Rightness as Fairness requires us to be fair to ourselves and to others, including animals. Further, the Four...