It is common in our everyday social and political life to justify such treatments as punishment, income, prizes, grades, or jobs by appealing to what people deserve. We claim that criminals deserve to go to prison for their wrongdoing, and that the amount of punishment which is appropriate has to do with how much they deserve. And we feel, even as children, the injustice of punishment, which is undeserved. Employees engage in bitter strikes not just because they want more income, but because they strongly believe they deserve more. Yet despite the importance of these claims in our everyday lives, philosophers have given the concept of desert scant attention compared with other moral concepts. Consequently, our understanding of the structure...