If it reflects economic fundamentals, then it implies that when important global news occurs, it is usually the sort of news that makes markets more volatile rather than stabilising them.

ECONOMIST: All fall down

It is found among people of all ages and classes and usually occurs after people experience some kind of financial upset, Dr Burchell added.

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Gupta said it was rare for teens to display symptoms of the disease, which usually occurs in young children.

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