Washington Post

The spy in your wallet: Credit cards have a privacy problem

Washington Post tech columnist Geoffrey A. Fowler tracked the same purchase at Target with two kinds of credit cards: the Chase Amazon Prime Rewards Visa and the Apple Card. Foto: Washington Post photo by James Pace-Cornsilk

I recently used my credit card to buy a banana. Then I tried to figure out how my credit card let companies buy me.

You might think my 29-cent swipe at Target would be just between me and my bank. Heavens, no. My banana generated data that's likely worth more than it is. It ended up with marketers, Target, Amazon, Google and hedge funds, to name a few...

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