What is human nature? In what ways are we limited or liberated by being human? This course will examine a number of philosophical theories about morality and rationality. In particular, we will focus on the question of what sorts of beings we would have to be in order for those theories to be true. What kind of psychologies, individual and social, are required for us to act morally or rationally? To achieve justice or knowledge? In exploring answers to these questions, we will draw on works by philosophers, economists, and social psychologists.