So in collapsed scenario you will just shoot everyone when you need something, no bartering for you. That is pretty animistic. Better watch your back in that case.
I belief live ammo will command a better price then that of your gold under those circumstances, so will freeze dried food.
Unless you`ve stored sufficient supplies, you`ll be the one 'dancing like a trained poodle' for your supper, that`s if the zombies' haven`t eaten you.