In much of the world, China is admired—or feared—as the rising new model of economic achievement under ruthlessly effective government direction. In the eyes of many others, the Chinese model is increasingly showing its contradictions and limits: economic, environmental, social, and political. Two of the world’s leading exponents of these respective views discuss where they disagree, and why—and what the next stage is most likely to hold for the world’s most populous and (until recently) fastest-growing nation