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Can OP (or anyone) provide a legitimate source for this?
From what I can find, Amazon and its partners do dynamic pricing (based on various algorithms) but I can find no evidence / source that it does personalized individualized pricing.
IOW, dynamic pricing is not done at the individual shopper level, but can be based on many variables like lightning deals, sudden spikes in demand, inventory issues (over supply / under supply) and various other factors which are not related to the individual shopper.
Anecdotal evidence is interesting, but not persuasive.
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.
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.