薛兆丰经济学讲义 · highlighted by fengyukongzhou

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薛兆丰

产品合格率提高的同时，质检的成本也在急速上升，上升到一定程度时，厂家就不值得再花钱去找那么一两件次品了。这时，它就会把产品先卖出去，实施三包，让广大用户自己来发现那些次品，只要承诺一旦发现次品包退包换就可以了。

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