Say, hypothetically, I'm a farmer with 2,000ha of barley at 3.3 tonne per ha, are you actually planning on paying $2 million in cash for 6,600 tonne to make beer?
Or are you thinking more of a "farmer" as someone selling individual artisan carrots?
The first scenario is done on account & settled later, an established customer/supplier relationship would easily handle a power outage.
Sticking with farmers as I'm in a rural area, still to this day large exchanges of labour and produce take place with neither physical cash nor e-cash forms, maybe at most a ledger note or IOU marker - in the great wash and flow of the seasons emergency mechanical work at harvest time can be repaid with a sheep some months later.
That's the trust of established relations.
Yeah, I think a lot of people regular people when dealing other regular people they trust, the principle of it comes out in the wash somewhere applies a lot.
Only if they have a cash register with a control unit that can handle offline operation. Without that, they would be committing a crime.
Where I live you can buy vegetables off a pickup truck that some guy parks by the side of the road. Cash only.