当然，如果市场参与者的活动带来额外的(不由本人、而由社会所承担的)“外部”成本或效益，譬如污染，那么竞争就无法实现最优化了。
Of course if the activity of the market participants produces external costs or benefits-costs or benefits to nonparticipants, as in the case of pollution, competition will not optimize output.
关注这些潜在的隐式活动，网站所有者将能够深入地理解那些沉默的大多数的喜好；利用这些数据，他们将能够对未来的搜索作进一步的优化。
By listening to these implicit actions, website owners can gain new insight into the preferences of the silent majority; by leveraging the data, they can optimize results for future searchers.
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