Then it is useless as a tool for improving performance.

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When we talk about dialogue for an entire millennium then it may be useless and fruitless to continue to lie to nature the way we do.

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But then again he has been absolutely useless everytime there has been any wet weather.

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Then, since it turns out to be useless, you get a crash.

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But Congress has made a habit of letting these measures expire and then bringing them back to life, no matter how useless they are.

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Then every now and then a written test would come up and I would be absolutely useless ... exams were always a nightmare.

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It dates back to Keynes, one of the few economists whose reputation has been burnished by the crisis. (Another is Hyman Minsky, whose main insight was that stability leads to too much debt, and then to collapse.) Most work in macroeconomics in the past 30 years has been useless at best and harmful at worst, said Mr Krugman.

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