Xi Jinping's surprising new source of economic advice

Zhou Qiren is an unusual economist. A professor at Peking University, he spent ten years toiling in the countryside during China's cultural revolution. "The same farmer", he observed, "worked like two totally different persons on his private plots versus on collective land." Unlike most economists, Mr Zhou still studies incentives and constraints from the ground up, starting not with abstract principles, but with concrete cases, often drawn from his travels around China and beyond. After a visit to a rice-noodle bar in Qinzhen, he wondered why it offered one-week courses showing others how to replicate its prized dish. On trips…