从本质上讲，预防性储蓄理论说的是，更多的不确定性会降低平均消费倾向(APC)，即比消费与收入的比率。

Essentially, what the precautionary-saving literature says is that more uncertainty reduces the average propensity to consume (APC), the ratio of consumption to income.

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上世纪80年代，美国家庭储蓄9%的家庭收入。该比率到了90年代便落到5%左右，而进入本世纪初后，则几乎不到2%了。

In the 1980s American households salted away 9% of their income; this fell to around 5% in the 1990s and to barely 2% in the early years of this decade.

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