Yes, but click data and search history is all integrated for Amazon and the combination of search, purchase and click is the true value. Not to mention every pu

Yes, but click data and search history is all integrated for Amazon and the combination of search, purchase and click is the true value. Not to mention every purchase and visit is linked to an account. [EDIT]not to mention that as an online store Amazon can do all kinds of automated A/B testing in real-time. At best with Walmart, in stores can capture some of this with a loyalty card and credit card.