In her study of medieval Chinese lay practices and beliefs, Valerie Hansen argues that social and economic developments underlay religious changes in the Southern Song. Unfamiliar with the contents of Buddhist and Daoist texts, the common people hired the practitioner or prayed to the god they thought could cure the ill or bring rain. As the economy rapidly developed, the gods, like the people who worshiped them, diversified: their realm of influence expanded as some gods began to deal on the national grain market and others advised their followers on business transactions. In order to...