Branko Milanovic, lead economist for the World Bank research group, sent me this comparative analysis based on household income or consumption surveys worldwide, adjusted for purchasing power differences.

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Wikipedia pages, by comparison, receive more traffic from Google than any Web site other than Myspace or Google's own Google Images, according to Hitwise, a Web analysis group.

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The group said that there are few established and agreed-upon standards for transaction or market data that underpin any analysis.

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