Last week (March 28, 2013), the – US Bureau of Economic Analysis – released the – revised (third estimate) – fourth-quarter 2012 US National Accounts data, which showed that real GDP grew by 0.4 per cent in the December quarter and 1.7 per cent for the 12 months to December 2012. The estimates were revised upwards from a quarterly growth rate of 0.1 per cent, largely due to higher estimated consumption and investment growth. In the six years to the December-quarter 2007 (the most recent real GDP peak) the average quarterly growth rate was 0.62 per cent. The US economy is still labouring with a huge cyclical output gap. That doesn’t stop a range of commentators from arguing otherwise. Other than the hysterical (and inaccurate) – David Stockman blast – there was a somewhat more measured article by Jeffrey Sachs in the New York Times (March 31, 2013) – On the Economy, Think Long-Term – which claims that the US problem is not cyclical but structural. For non-economists, that means that the policy solutions are quite different. In the absence of hysteresis, fiscal and monetary policy cannot solve a structural problem. The only problem with Professor Shock Therapy’s hypothesis is that it doesn’t stack up with the evidence. The evidence does not support the assertion that job polarisation in the US is constraining economic growth. The evidence continues, unequivocally, to support the view that the US economy is suffering from a major cyclical downturn (output gap) and needs a carefully targetted, aggregate demand stimulus.