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

事实证明，供给曲线实上就是边成曲线。

Notice in this example the marginal cost is increasing.

注意，在这个例子中，边成一直在增加。

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

如果雇佣工人带来的边于边成，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。

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

此时，最后一个披萨的边成是巨的。

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是9美元，那么你也应该生产它。

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

最终，总有一座公园的边会小于边成，于是他们停止建造公园。

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是12美元，你就不应该生产它了。

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为零，因此对开发人员来说是非常有利可图的。

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

均衡点最有率，因为最后一个单位的边等于这个单位的边成。

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（即边成）进行投标。

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

下一千瓦时的边成为零。

Marginal cost... Aha, I was hoping you'd say it.

边成...啊哈，我希望你能这么说。

And the marginal cost of growth is zero and you go bananas.

而增长的边成为零，你就会发疯。

The marginal cost is relatively low.

边成相对较低。

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。

It's where marginal revenue equals marginal cost, right?

就是边等于边成，对吗？

For the short-period supply price is the sum of the marginal factor cost and the marginal user cost.

对于短期供应价格是边要素成和边用户成之和。

It's where marginal--it's where the marginal cost and the demand curve intersects.

它是边成和需求曲线的交点。

And one reason these industries have low marginal costs is because they can take advantage of economies of scale.

这些行业边成低的原因之一是它们可以利用规模经济。