Abstract
This chapter discusses psychological egoism, ethical egoism, rational egoism, partiality, and impartiality. Partiality involves assigning more importance to the welfare or will of some individuals or groups than to the welfare or will of others. Egoism is an extreme form of partiality in that it gives overriding importance to the welfare of just one individual. While there are different kinds of impartiality, the kind that juxtaposes with egoism and partiality is impartiality towards the welfare or will of each.