Yes, the money will pretty much be worthless. Some are buying gold and silver, but I agree that the barter system using everyday essentials will be the route most survivors will follow. I have seen people recommend using alcohol as a barter item, but I would only feel comfortable with that if there was considerable distance gained away from the recipients before they started chugging it down. I personally would not use ammo was a barter item unless I was desperate for some specific goods. Ammo will be next to impossible to replace, so hanging onto it makes better sense. Heck, whether it is due to stock-piling or panic-buying, a person can't find anything in the way of ammo now.