CHICAGO - MAY 21:  A trader in the S&P 500 stock index futures signals an offer at the Chicago Mercantile Exchange May 21, 2007. The S&P cash index jumped above its previous record close of 1527. 46 during intra-day trading before falling back to close at 1525. 10. Getty Images logo Getty Images 30 months ago

CHICAGO - MAY 21: A trader in the S&P 500 stock index futures signals an offer at the Chicago Mercantile Exchange May 21, 2007. The S&P cash index jumped above its previous record close of 1527. 46 during intra-day trading before falling back to close at 1525. 10.