2 (Exercise) For the case of constant elasticity of demand, what is marginal revenue?
在需求弹性不变的情况下，边际收益是多少？
Part of the increase stems from human activities—directly, in the case of construction, or indirectly, when it results from clearing vegetation from marginal land in order to farm it.
尘埃量的增加一部分原因源于人类活动——比如，建筑，它属于直接原因，又如，为了耕种而将边际地块上的植物清除所造成的后果就属于间接原因。
Part of the increase stems from human activities-directly, in the case of construction, or indirectly, when it results from clearing vegetation from marginal land in order to farm it.
部分原因是人类活动- - -例如建筑施工这样的直接原因，或者是为了开垦贫瘠土地而清理植被这样的间接原因。
Figure 5.11 illustrates the same point for the case in which external economies affecting marginal cost curves are sufficiently important to yield a negatively sloping supply curve to the industry.
影响边际成本曲线的外部经济，对于得出一条负斜率的行业供给曲线是非常重要的——图5.11即以这种情况说明上面相同的观点。
In case of changing the single factor, the cost of marginal value should equal to its marginal profit.
在单一要素变动的情况下，边际价值成本应当等于边际价值收益。
In that case the marginal rate of substitution need not equal the ratio of the prices.
在那种情况下，边际替代率不必等于价格比率。
In this case, even with increasing marginal utility, we do not necessarily get specialization in consumption.
在这种情况下，即使存在边际效用递增，人们也并不必然是专门消费某商品。
In this case, the enterprises 'pricing is between the marginal cost pricing and the monopoly pricing.
这时，企业的定价介于垄断定价与边际成本定价之间。
In this case, the enterprises 'pricing is between the marginal cost pricing and the monopoly pricing.
这时，企业的定价介于垄断定价与边际成本定价之间。
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