The main drivers of strategic default are the scale of negative equity, and moral and social considerations.

策略性违约的主要动因是房屋负资产的规模，以及道德和社会考虑。

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They argue that a generous international bankruptcy procedure would worsen the problems of moral hazard, as default became an easy option.

ECONOMIST: The perils of global capital

We can see liberalism, as Haidt seems to, as a deviation from the default that tunes down the binding dimensions of the human moral sensibility.

FORBES: The Moral Default Setting: Liberal or Conservative?

Allowing Greece to default and remain in the euro would create a precedent that would increase moral hazard.

WSJ: Agenda: Greek Situation Is Most Serious of Latest Euro Crisis