People look at the Delhi Stock Exchange building with a news flash of "Wall Street sinks on rising economy worries," in New Delhi, India, Friday, Aug. 5, 2011. Global stock markets tumbled Friday amid fears the U.S. may be heading back into recession and Europe's debt crisis is worsening. The sell-off follows the biggest one-day points decline on Wall Street since the 2008 financial crisis. (AP Photo/Manish Swarup) *** Local Caption *** India World Markets.JPEG-0df08.jpg