This Is How Your Financial Data Is Being Used to Serve You Ads | Adweek

Check the full article for a round-up of data collector/broker modus operandi

"Here's the short version: Everyone in advertising is buying exhaustive records of your purchases—all your purchases—and comparing them to your viewing habits so that they know which ads you saw and whether or not they changed your behavior.
If you feel like this is kind of invasive, that probably means you understand me so far."

This Is How Your Financial Data Is Being Used to Serve You Ads | Adweek