Find out with this test devised by Dr Raj Persaud, consultant psychiatrist, at the Maudsley Hospital, London.

伦敦莫德斯利医院的精神病顾问拉杰·佩尔绍德博士设计了这项测试。

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Mr Persaud points to another source of folly: chasing cross-country correlations in equity markets.

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Dr. Deborah Persaud, a virologist with Johns Hopkins Children's Center, was lead author on the report.

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Surprisingly, the drop in high-tech share prices has probably helped the greenback, says Mr Persaud.

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