当市场价格能够准确反映成本和收益时，看不见的手是有益的。
When market prices convey accurate signals of cost and value, the invisible hand promotes the common good.
多年来的米考伯式的乐观主义已然不见踪影，众多的报纸发行商终于相信，再怎么压缩成本，裁减员工，都赶不上收益急剧下降的速度。
After years of Micawberism, many newspaper publishers now accept that no amount of cost-cutting and laying off of journalists can keep up with plummeting revenues.
这个简单的例子显示了当市场价格无法准确反映与产品相关的社会成本和收益时，看不见的手就失效了。
That simple example captures the classic breakdown in the invisible hand when a product's market price doesn't reflect all its relevant social costs and benefits.
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