cash will be nothing more than paper to light a fire. gasoline will be non existant and if you had it, it and you car would be quickly stolen if caught driving down the road.
food, ammo, guns, clothes, firewood, vitamins, medicine, fresh water will be the ONLY currency.
Toilet paper is the poor man’s gold. Liquid detergent is liquid gold. They’ll probably work too.
To the extreme your have all approach is correct. But if you need to trade and can’t barter cash option is useful. You might make a friend and remain locked and loaded.
“food, ammo, guns, clothes, firewood, vitamins, medicine, fresh water will be the ONLY currency.”
Just like Mad max and Book of Eli.