The worst example of institutional weakness, argues Mr Coulibaly, was the sinking of a ferry in 2002, when more than 800 people perished.

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Delegating to others would mean wasting time, losing control of my projects, and worst of all, showing weakness in my ability to get the job done.

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Weakness in financial stocks continued, with Bank of America and JPMorgan Chase among the worst performers down more than 2% apiece.

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Part of the answer lies in the fact that the New York publishing establishment has a weakness for books that portray the upstart city of the West, its chief cultural rival, in the worst possible light.

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