Question
Suppose you have data on 200 firms, and half advertise on Google. If the advertising firms had higher sales than nonadvertising firms before they started
Suppose you have data on 200 firms, and half advertise on Google. If the advertising firms had higher sales than nonadvertising firms before they started advertising on Google, does this fact impact your ability to measure the effect of Google advertising on sales using these data?
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Yes the fact that the advertising firms had higher sales than nonadvertising firms before they started advertising on Google could impact the ability ...
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Microeconomics An Intuitive Approach with Calculus
Authors: Thomas Nechyba
1st edition
538453257, 978-0538453257
