Have you got a link to the study about this? To be honest, I feel a lot of these claims are like nutritional studies, where when you look into it the original study wasn't great or are for highly specific scenarios but the general claim will be spread for decades anyway.
For this one for instance, what was being bought? How expensive? How did the prices vary? What about shelf positions? Who were the customers? How many customers? How were they made to pick a direction? How long were they shopping for? What factors were and weren't controlled for?
Usually when the controls aren't great, you find that further studies that improve on the controls lead to the measured effect size getting smaller and smaller.
Maybe not the case here, I don't know, but I'm very skeptical about general claims that sound hard to measure.
For this one for instance, what was being bought? How expensive? How did the prices vary? What about shelf positions? Who were the customers? How many customers? How were they made to pick a direction? How long were they shopping for? What factors were and weren't controlled for?
Usually when the controls aren't great, you find that further studies that improve on the controls lead to the measured effect size getting smaller and smaller.
Maybe not the case here, I don't know, but I'm very skeptical about general claims that sound hard to measure.