NEW YORK (Reuters) - Investment bank HSBC has revised downward its forecast for 2007 economic growth and cautioned that the risk of an outright recession is growing as a retreat in housing threatens household balance sheets. ADVERTISEMENT The company argues that while corporate profits have remained sky-high, the incomes of most Americans have effectively fallen over the last 18 months. That, say economists Stephen King and Ian Morris, could be a recipe for hard times in an economy that relies on consumers for over two-thirds of its strength. "Never before have households been so hard hit at a time companies...