In terms of resilience to wars, disasters, power outages and similar (which is one of two arguments for cash the other being privacy), I think the key functions

In terms of resilience to wars, disasters, power outages and similar (which is one of two arguments for cash the other being privacy), I think the key functions are probably food, fuel and similar. That car sales can continue is probably not as important. That’s why Starbucks can probably get away with rejecting cash in Sweden but a large grocery chain probably can’t and won’t.