That is partly a question of scale: one lucky break by a smaller firm could double its reserves, but barely register at one of the majors.

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This decision has the potential to trigger a full-scale bank run across the euro area and such an outcome could place in question the continued existence of the euro as a common currency.

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This question was addressed in a large-scale project by Gretchen Rubin who tried to increase her happiness over the course of a year by setting herself specific goals that covered, among other areas, marriage, work, leisure, parenthood, friendship, money and so on.

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