Abstract

I argue that Plato's psychological theories are motivated by concerns he had about moral theory. In particular, Plato rejects the modern account of rationality as the maximization of subjectively evaluated self-interest because, had he adopted such an account, his theory of justice would be subject to criticisms which he holds are fatal to the contractarian theory of justice. While formulating a theory to remain within ethical constraints sometimes violates the canons of scientific theorizing, Plato avoids this mistake.