Clinton-era Treasury secretary and former Obama economic adviser Lawrence Summers last week in Washington, D.C. Chip Somodevilla/Getty Images hide caption

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Anti-government demonstrators crowd Cairo's Tahrir Square in February 2011. A report from HSBC says Egypt and other Arab Spring countries will lose a total of $800 billion by the end of next year because of the unrest. Mohammed Abed/AFP/Getty Images hide caption

itoggle caption Mohammed Abed/AFP/Getty Images