Richard von Glahn is Professor of History at the University of California, Los Angeles. He is the coeditor of The Song-Yuan-Ming Transition in Chinese History (2003) and the author of Fountain of Fortune: Money and Monetary Policy in China, 1000-1700 (California, 1996) and The Country of Streams and Grottoes: Expansion, Settlement, and the Civilizing of the Sichuan Frontier in Song Times (1987).