I was thinking about the "beers and diapers" example during dinner, and maybe there can be some truth in it:

if beer and diapers are highly correlated, you should not set them together (as in the example), but instead put them as far apart as you can (as in real life). If there's someone in the store who wants to buy beer and diapers (me, for example), he'd have to traverse the whole store. This way the store can present its wonderful products along the way, which is exactly what they want.