Coins will go up in value the more they become scarce and they have machines at stores where you can turn them in for crypto.
Still, all of this, the coins, the ham radios or morse code etc. will only work if you have networked with other like minded people.
And considering gas will not be available people will need a network that is within walking distance.
It will be very hard to network after we are cut off.
The others in the like-minded non complying network will have to also have a ham radio, telegraph machine, and coins or other things for bartering.
Has anyone had meetings with others from their chapel to make plans?
This will be the tricky part because people will be encouraged to snitch on others.
The other thing to consider is bug out bags and living in the forest for a time. One would need to know how to forage.