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As the Chinese economy tumbles into recession, the World Bank’s chief economist is embarking on a campaign to reverse negative perceptions about his home country’s prospects.  “China has the potential to achieve another 20 years of 8% growth,” said Justin Yifu Lin in a speech sponsored by the Federal Reserve Bank of San Francisco late last month.  Moreover, he also has stated in various venues that in two decades the Chinese economy could, in purchasing power parity terms, end up twice the size of the American one.