If hiring that worker brings in more marginal revenue than marginal cost, then, congratulations!

如果雇佣工人带来的边大于边成本，那么恭喜！

Now, this specialization decreases the the marginal cost of each pizza.

这种专业化减少了每个披萨的边成本。

Now, the marginal cost of that last pizza is huge.

此时，最后一个披萨的边成本是巨大的。

Since the marginal cost of creating virtual items is zero, they are very profitable for developers.

由于创建虚拟项目的边成本为零，因此对开发人员来说是非常有利可图的。

Eventually, the marginal benefit of another park will be less than the marginal cost, so they stop building parks.

最终，总有一座公园的边效会小于边成本，于是他们停止建造公园。

Notice in this example the marginal cost is increasing.

注意，在这个例子中，边成本一直在增加。

If the marginal cost of next pizza is 9 dollars then you should produce that pizza too.

如果下一个披萨的边成本是9美元，那么你也应该生产它。

It turns out that supply curves are really just marginal cost curves.

事实证明，供给曲实上就是边成本曲。

But if the marginal cost of the next pizza is 12 dollars, you shouldn't make it.

但如果下一个批萨的边成本是12美元，你就不应该生产它了。

Suppliers bid according to how much it would cost to provide an extra unit of power, known as its marginal cost.

供应商根据提供额外单位电力的成本（即边成本）进行投标。

Equilibrium is efficient because the marginal benefit of the last unit consumed equals the marginal cost of that unit.

均衡点最有效率，因为最后一个单位的边效等于这个单位的边成本。

So the first price auction is a classic tradeoff, marginal benefit and marginal cost.

因此，首价拍卖是一种典的权衡，即边与边成本之间的取舍。

The marginal cost is you'll get less surplus if you win.

边成本在于，如果你赢了，你将获得的剩余价值会减少。

I think you should almost assume that the marginal cost is zero.

我认为你几乎可以假定边成本为零。

The marginal cost for the next kilowatt-hour is zero.

下一个千瓦时的边成本为零。

So Russia can still export at 60, its above marginal cost.

因此，俄罗斯仍能以60美元的价格出口，这一价格高于其边成本。

And the thing underpinning it all is the software itself has zero marginal costs.

其背后的关键在于，软件本身具有零边成本的特性。

Now this is marginal cost or above so this is the best response.

现在这是边成本或以上，所以这是最好的反应。

In particular, we find that prices in the market are equal to marginal cost.

具体来说，我们发现市场价格等于边成本。

That's where the marginal cost and the demand thing, demand lines intersect.

学生：这就是边成本和需求、需求的相交之处。