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1·But statement (3) does not concern the average propensity to consume.

但结论(3)和平均消费倾向并无太大关系。

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

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。