But the explanation lies in the rapid adjustment of the leptin system to the environment.

ECONOMIST: Obesity

Trying to meet the 3% deficit target next year, from 9% in 2011, is too rapid an adjustment.

ECONOMIST: Charlemagne

Some research suggests that such high deficits tend to be unwound quickly, by a rapid downward adjustment in the currency.

ECONOMIST: Worth less than a euro | The

Now that investors are less willing to lend money, a rapid, jarring adjustment in which expenditures are brought down into alignment with receipts seems unavoidable.

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But economists believe the rapid rise of e-commerce has overwhelmed that adjustment process and that many of the jobs added in this sector could be scratched in January.

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