Amazon doesn’t track users, but it does have various sellers selling the same items. The search results aren’t always in the same order and sometimes the price on the item page is based on whichever seller has that item.
For example, I wanted a faux leather jacket. I found dozens of them in various sizes from different sellers. Changing the size on one page changed the seller entirely.
Omega_Jimes@lemmy.ca 3 weeks ago
I haven’t seen any studies, I seem to remember there was some news reports many years ago.
I do know that I’ve stood in my living room, on the same wifi, and looked art the same item from Amazon on my phone and my brother in laws phone and seen different prices. But that’s just another anecdote.