1. 外部效果：从收入的项目来看,我们大概可以有电子商务的佣金、广告收入以及课程订阅的服务费用,但是若从价值累积的时间序列分析来看,网站的收入将会因为需求面的网路外部效果(Externalities)与学习者锁住效果的不断产生正向回馈的效果,
1. Occupational disease is one of the externalities that comes from our still immature market economy.
2. We ignored the externalities of ecological degradation because conventional economic theory and national statistics found them either difficult to measure or convenient to assume away.
3. This understanding would help them during their talks with politicians once positive externalities are clearer.
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4. It will also reduce road accidents and avoid other externalities associated with private vehicle travel.
5. However, these savings must be balanced against its considerable negative environmental and social externalities.