CHICAGO (Reuters) – There is a "significant" chance the U.S. economy will slip back into recession in the next two years although a reversal is unlikely in the next few months, researchers at the San Francisco Federal Reserve Bank said on Monday. The probability of another recession over the next 18 to 24 months is higher than that of expansion, researchers said in the latest issue of the regional Fed bank's Economic Letter. Concern has risen in recent months that the United States might be headed for a 'double-dip' recession as measures of consumer spending and confidence have dropped and...