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A comment on The new dot com bubble is online advertising (2019). Parent comment

Re:The new dot com bubble is online advertising (2019) by jefftk on Saturday October 02, 2021 @09:35AM (#28728454)
You can run that same study with a control group, and sophisticated advertisers do. Show some of the users ads for your product, and other users ads for something unrelated, and compare their purchases of your product.
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