But as Andrew Smithers, an independent financial analyst, points out, this policy is fraught with difficulty, because one never really knows how much money is enough.

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One positive is that oil prices have never really fallen significantly enough to be a cause for concern.

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Berezovsky is clearly one of those who never feels he has enough.

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"It's never enough time to prepare a team in one week but this is an exceptional situation, " Hiddink added.

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