To test the effectiveness of a two Web advertising agencies, you increase your ad purchase with agency A by 50% without changing your purchase through agency B. The referrals to your website from agency A increased by only 34% but the referrals from agency B fell by 21%. Why might the difference-in-difference estimate of the referrals per dollar through agency A be biased?

Managerial Economics: A Problem Solving Approach
5th Edition
ISBN:9781337106665
Author:Luke M. Froeb, Brian T. McCann, Michael R. Ward, Mike Shor
Publisher:Luke M. Froeb, Brian T. McCann, Michael R. Ward, Mike Shor
Chapter17: Making Decisions With Uncertainty
Section: Chapter Questions
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To test the effectiveness of a two Web advertising agencies, you increase your ad purchase with agency A by 50% without changing your purchase through agency B. The referrals to your website from agency A increased by only 34% but the referrals from agency B fell by 21%. Why might the difference-in-difference estimate of the referrals per dollar through agency A be biased? 

 

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