Now I will concede that different distributors and middlemen can effectively change prices by 2-4%.
You seem to be focusing on retail prices, which are irrelevant to our discussion inasmuch as we’re talking about calculating the ASP for the manufacturer. Variations in the ASP for the manufacturer according to the location and the middlemen are about an order of magnitude greater than the 2-4% range you cited, i.e. they’re as large as 40%.
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”