LONDON – The fate of the world economy hinges on what happens to house prices in America and that may not be a good thing, former Federal Reserve chairman Alan Greenspan said on Monday. Speaking at the Reuters headquarters in London, the former Fed chair delivered a gloomy prognosis on the state of the global economy – U.S. house prices are likely to fall further and they could drag the rest of the world with them. * * * “The critical variable in this judgement is the price of homes in the United States,” said Greenspan, who ran the U.S....