Definition: a good is public if the marginal production cost is lower than the marginal billing cost.

定义：一个好的公众事物仅当其边际产值小于其边际广告值。

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Bundling selling is a kind of popular method for selling information goods. And this method should be taken into account on the basis of low marginal production cost.

捆绑式销售是当前比较流行的信息商品销售方法之一，这种方法充分考虑了生产时的低边际成本。

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Moreover, as less fertile or accessible land is brought under cultivation, the marginal cost of food production rises.

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。

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In fact, we believe that when the great gold selloff occurs and production is taken off line the marginal cost of production will decline as the least efficient mines are closed first.

FORBES: Gold Sets Up As The Next Great Short

As gold prices rose, less efficient mines became viable and drove up the marginal cost of production.

FORBES: Gold Sets Up As The Next Great Short

The rush was on to take advantage of this price arbitrage that provided almost monopolistic prices, and only marginal costs of production.

FORBES: Granite Countertop Craze Has Cost U.S. More Than First Gulf War