Milton friedman once compared the business cycle to an elastic string stretched on a board. How far the string is plucked determines how much it springs back; similarly, the depth of a recession decides the strength of recovery. America's recent experience has not been kind to the plucking model. Although the recession was the deepest since the second world war, the recovery has been a disappointment. In the three years since the end of the recession in mid-2009, growth averaged 2.2%, barely half the 4.2% average of the seven previous recoveries.
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