That's because Walmart is gigantic, not because blue vs green walls make such an enormous difference. It's the difference between having some vapid happy tunes

That's because Walmart is gigantic, not because blue vs green walls make such an enormous difference. It's the difference between having some vapid happy tunes playing in the super market and them analyzing your profile and previous purchases to bombard you with customized messages to make you feel bad because you'll buy more. The level of invasiveness is very different, and you need thorough tracking and denial of privacy for one but not the other.