Comment Re: Sorry, privacy-preserving? (Score 1) 38
What doesn't work? Tracking people through the aisles allows some optimization (or the opposite, depending on how sadistic the marketing people are) of product layouts that isn't possible by simply analyzing sales after the fact, even if you can tie them to an individual over time. Of course they could just use cameras to do this much more effectively, but the researchers had to come up with some angle to justify their work.