Later that same day, our consumer is surfing across sites linked by a BT network and is shown an ad for a special offer on the hard drive he was just looking at earlier.

The ad, tailored to his recent behavior, states that new owners of Superior Computers will receive 15 percent off the hard drive if they buy before the end of the week. This offer is too good to pass up, so he clicks the ad and makes the purchase.

Next: Conclusion