This doesn't totally respond to your line of reasoning but keep in mind that handling cash isn't free. There is time, logistics, and risk involved. In the US, c

This doesn't totally respond to your line of reasoning but keep in mind that handling cash isn't free. There is time, logistics, and risk involved. In the US, consumer bank accounts typically come with free cash handling, but not business accounts. It's common for cash handling to cost around 1%, can be more depending on cash mix. Some of this is bank fees (e.g. I have a business account that charges $0.01 per note for cash deposit), some of it is expenses on the business like a drop safe (often rented) and armored transport service. There are indirect costs as well, e.g. insurers will factor in the risks of high cash volume. The cost of cash handling is part of what has allowed card payments to proliferate, but then that created the conditions for card processors to ratchet up fees.