A few days ago, I came across a post on LinkedIn about pricing. It showed two versions of the same bottles side by side. In one, the price appeared above the product. In the other, it appeared below. The question was which version sold 35.2% more. Except the price wasn't the first thing I noticed. The labels were different. One set of bottles had white labels. The other had black labels. And my immediate thought was: Then how do we know it was the price? Maybe it was. I don't