[Lio]

My worry is that that merchants offer higher prices based on their assessment of my private data.

We've had the situation before when booking holidays that my wife sees higher prices for the same hotel on her laptop while sitting right next to me. Once she cleared cookies the price went down to match what I've been offered on a clean computer.

That was a few years ago so I would imagine IDing potential customers is done via browser finger printing now rather than cookies and so harder to protect against.

Really, who wants their bank or payment network to collude in higher prices?