U.S. credit rating downgrade ‘inevitable’

Monday’s debt ceiling deal might satisfy those rating agencies that warned of a possible downgrade of the United States’ credit rating if the the parties did not end  the political stalemate. But does the deal reassure agencies worried about the fundamental weaknesses of the U.S. economy?  Gillian Tett, a managing editor of the  Financial Times, says a downgrade is inevitable and she tells us what to expect from the different ratings agencies and how the markets will react to an impending downgrade.