NEW YORK - SEPTEMEBER 14: Boris Johnson (C) the mayor of London, flanked by Chief Executive Officer of NYSE-Euronext Duncan Niederauer (R) and City of London Policy Chairman, Stuart Fraser (L) rings the closing bell at the end of trading day on September 14, 2009 in New York City. Johnson has been promoting tourism to London around New York City with stops at the 5th avenue Disney Store, the NASDAQ exchange, and the Broadway show 'Billy Elliot.'