I'm really struggling to see why you'd want to pay everything in cash.
Personally, I don't even usually have any cash. New Zealand is a bit different in that there are increasingly few places that don't take cards. Even farmers markets and food trucks usually take cards these days. Hell, the parking machine also takes cards. I can go weeks without using actual physical money.
How much does cash handling costs, counting/paying in, insurance, fake notes, transport to bank, uninsured risks, shotgun robberies, still be less than 3% but not far off imho, we need something smarter than cash but not from giant ripoffs such as mc/visa/amex
Personally, I don't even usually have any cash. New Zealand is a bit different in that there are increasingly few places that don't take cards. Even farmers markets and food trucks usually take cards these days. Hell, the parking machine also takes cards. I can go weeks without using actual physical money.