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

事实证明，供给曲线实际上就是际成本曲线。

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

如果雇佣工人带来的际收益际成本，那么恭喜！

Notice in this example the marginal cost is increasing.

注意，在个例子中，际成本一直在增加。

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

由创建虚拟项目的际成本为零，因此对开发人员来说是非有利可图的。

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

如果下一个披萨的际成本是9美元，那么你也应该生产它。

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际成本是12美元，你就不应该生产它了。

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

种专业化减少了每个披萨的际成本。

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

最终，总有一座公园的际效益会小际成本，是他们停止建造公园。

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

此时，最后一个披萨的际成本是巨的。

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

均衡点最有效率，因为最后一个单位的际效益等个单位的际成本。

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（即际成本）进行投标。

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

下一千瓦时的际成本为零。

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

际成本...啊哈，我希望你能么说。

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

而增长的际成本为零，你就会发疯。

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，一价格高其际成本。

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

对短期供应价格是际要素成本和际用户成本之和。

And one of the reasons this model works is because these industries all tend to have low marginal costs.

种模式有效的原​​因之一是些行业的际成本往往较低。

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

些行业际成本低的原因之一是它们可以利用规模。

The marginal cost is relatively low.

际成本相对较低。

The short-period supply price, on the other hand, is equal to the marginal prime cost.

另一方面，短期供应价格等际主要成本。