A seeming constant in the history of capitalism, greed has nonetheless undergone considerable transformations over the last five hundred years. This multilayered account offers a fresh take on an old topic, arguing that greed was experienced as a moral phenomenon and deployed to make sense of an unjust world. Focusing specifically on the interrelated themes of religion, economics, and health—each of which sought to study and channel the power of financial desire—Jared Poley shows how evolving ideas about greed became formative elements of the modern experience.