U.S. interest in soccer perked up during this year's World Cup tournament. Two soccer journalists debate the trends of soccer in America and their origins.

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As soccer's World Cup kicks off in Germany, two authors talk about the history and culture of the tournament.

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Did pro football, a multibillion-dollar business, become America's most popular sport by practicing non-free-market economics? Under football's non-free-market model, firms compete furiously, yet share the industry's revenues, with labor and with each other. Economics correspondent Paul Solman reports.

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