Imagine, if you will, someone lurking near the cash registers at Nordstrom’s, who pops out when a clerk is about to ring up a sale, and tells the customer she could get that handbag cheaper at the other end of the mall at Macy’s.

How long do you think it would take for Security to toss this lurker out of the store? Less time than it took you to read that question.

Conceptually, transaction hijacking is no different from the scenario I painted. It isn’t just a privacy violation, it’s trespassing and likely a whole host of other violations designed to prevent people from impeding commerce.