来自《耶鲁大学开放课程：金融理论第5集第5集》

So it may be that water is much more valuable than diamonds

所以水也许比钻石更值钱
because it does a lot more good for everybody and for the world

因为水对整个世界全人类的意义
as a whole than diamonds do, but the last drop of water,

要比钻石大得多
really most people have as much water as they need,

但当人们拥有足够多的水的时候
the last drop of water is not doing that much whereas the last

最末一滴水就没有什么价值然而
diamond is a rare thing and not many people have them.

而钻石由于其稀有性变得价值连城
So the last drop of water is worth less than the last equal

所以最后一滴水比最后一颗同等质量的
weight of diamonds and therefore water is much cheaper than

钻石要廉价因此水比钻石便宜
diamonds even though water's much more

即使整个水体的价值比钻石大很多
valuable as a whole than diamonds.

但是水却很便宜
The price of things depends on their marginal utility.

所以事物的价值取决于它的边际效用
A third implication of what we did is that there's no such

第三点含义是