Yeah, they make more profit by introducing self-checkout, but I doubt It’d be 10% or more. I may be wrong. If there is any data on that, I’d love to see it.

But even if they can afford to lower all prices by 10%, I can’t imagine they would just take the financial hit. Why wouldn’t they compensate by increasing prices?

To me it doesn’t make sense in any scenario.

If you believe in the free market, this would lead to nothing, as supermarkets are already providing their goods for the lowest reasonable prices, because of competition.

If you believe that supermarkets are engaging in price collusion, there is nothing that would stop them from just all increasing their prices further.