By monitoring ad campaign performance, an advertiser may obtain the information needed to:

Is a Google Adwords Fundamental exam answer.
The correcta answer is:
determine if campaigns are meeting overall marketing and conversion goals

Explanation and more info: 
http://www.certificationanswers.com/en/by-monitoring-ad-campaign-performance-an-advertiser-may-obtai

The summary of the given topic is explained below throughout the following portion.

Explanation:

The production phenomenon known might be why the additional expenses you generate that for each unit, are considered as Economies of scale. Mostly since the greater optimized production operations you develop, the further optimized they are.

Example:

Because of its scale, perhaps the company could be interested in receiving credit standards.