For example, in his magnificent book The Wealth and Poverty of Nations, the economist David Landes renews the idea that disease and demography always gave Europe a decisive edge over China, but adds a new twist by suggesting that dense population favored centralized government in China and reduced rulers’ incentives to exploit Zheng’s voyages. Because they had no rivals, most Chinese emperors worried more about how trade might enrich undesirable groups like merchants than they did about getting more riches for themselves; and because the state was so powerful, they could stamp out this
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