First, the Federal Reserve could drain bank reserves and reduce the excess liquidity at other institutions by arranging large-scale reverse repurchase agreements with financial market participants, including banks, government-sponsored enterprises and other institutions.

WSJ: Bernanke Op-ed in WSJ: The Fed��s Exit Strategy

There is no sign of a Labour reverse on anything like this scale.

ECONOMIST: How to see through the spin

There is no economy of scale that can reverse this trend.

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"Tesco's exit from the US is a reminder for managers of the dangers of going blindly for scale and cost leaders, the wheels of which are difficult to reverse if you need to change course to becoming a retailer known for first-class customer experience, " Prof Bhalla said.

BBC: Tesco profits fall as supermarket pulls out of US