Daily Briefing September 30

Amazon would really like a peek at your Target receipts, all in the name of refining its ad business. The goal is improved micro-targeting -- if Amazon can figure out what people are not buying on Amazon, for instance, it can serve them ads for Amazon products that they might not think to buy online. What's more, Amazon is collecting all this data in order to learn what kinds of purchases it has yet to monopolize.

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