The existence of cash is probably the least of one’s problems in that scenario. How is food going to be delivered to stores without working gas pumps? How will stores open their electronic doors or process payments without a cash register?
If this is something you are worried about, store enough non-perishable (eg canned) food in your home so you don’t starve in that scenario.
Lv_InSaNe_vL@lemmy.world 12 hours ago
Gas stations are required to have generators where I am for this exact scenario.
These are legally required to be openable by hand without power in the United States.
Hence the reason why cash still exists.