What’s the Secret to Economic Growth? We Just Don’t Know

 On Nov. 2, Federal Reserve Chairman Ben Bernanke confidently predicted that in 2012, the U.S. economy will grow at a rate of 2.5 percent to 2.9 percent. A few months earlier Bernanke predicted that the economy would expand 3.3 percent to 3.7 percent next year. A few months before that, the Fed projected growth in 2012 to be somewhere between 3.5 percent and 4.2 percent.

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