而且当贫瘠或者不那么适合种植的土地被开垦出来后，食品生产的边际成本也提高了。
Moreover, as less fertile or accessible land is brought under cultivation, the marginal cost of food production rises.
而软件，即指令电脑从事何种工作的编程，可以电子方式进行生产、配送和营销，因此，其边际成本趋于零。
Software — the programming that tells computers what to do — can be marketed, manufactured, and distributed electronically, giving it a marginal cost that is close to zero.
模型的模拟结果阐释了在什么情况下附属商品的价格应该比生产它们的边际成本更高、更低或者一致。
Model simulations illustrate that the regressions can be used to predict whether aftermarket prices should be above, below or equal to their marginal cost.
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