SCBA系统价格不菲。

SCBA systems are expensive.

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效能定价——支持资源效能分配的一个系统价格。通常效能定价是当价格等于全部微小成本时获得出的结果。

Efficient pricing — a system of prices which supports an efficient allocation of resources. Generally efficient pricing is achieved when prices are equal to total marginal cost.

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这些访问码的价格通常在每门课程80美元到155美元之间不等，学生需要通过这些访问码才能在线使用麦格劳·希尔和培生等教育公司开发的系统。

The codes—which typically range in price from $80 to $155 per course—give students online access to systems developed by education companies like McGraw Hill and Pearson.

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