Final answer:
Understanding circulation, effective reach, and distribution objectives is vital for advertisers to gauge the reach and impact of their ads in a publication.
Explanation:
Circulation is the number of copies of a publication that are distributed. It is crucial for advertisers to know the circulation figures as it indicates the potential reach of their ads.
Effective reach refers to the percentage of a target audience that is exposed to a specific media vehicle at least once during a specified period.
Distribution objective is the goal set by a media company regarding how widely they want their content to be distributed.
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