It requires a stage of equivalent scale and self-confidence.

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Much more importantly, it requires someone who will, from Day One, have the confidence of that community's professionals and command the respect of Congress, his or her counterparts in the executive branch, foreign interlocutors, the public and the press.

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It pays I think to have some humility but you also have to express views and that requires confidence and belief.

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So after what traders described as the scariest week of trading in European debt markets since the creation of the eurozone - with some investors not wishing to touch Italian government debt - it is increasingly clear that a restoration of confidence in the integrity of Europe's currency union probably requires a more comprehensive and far-reaching plan than just sorting out Greece.

BBC: Business