So...this all hints at something I dealt with at work just before Christmas. It was a Friday evening....literally minutes before we are closed. The business sells used containers like 55 gallon barrels. I have closed things down and am grabbing my things from the office to leave when I hear someone in the werehouse hollering. Before I can set things down and walk out to the main area they have gotten back in their car and are pulling away. I see that they are headed to an area of the property that there is no exit so I know they will be coming back by. I wait there for them to pull back around. They pull up and need barrels to store water in. Lots of barrels. Swell...show up at the last minute and need a large order. So...I go grab an example to see if it meets their needs. By the time I am back with it they are out of the car and unloading their stuff and rearranging things to fit the barrels. I show them what we have and explain the price. They want a bunch. 5 they will take 5. All frantic and such. So I go and grab barrel 2 and bring it up...and barrel 3...at which the wife asks if we will take a credit card. The store policy is cash only for retail sales. I can make an exception...normally...but that system has been shut down already as it is now after closing. Even at that we are to charge a service fee if we do make an exception. I don't bother to tell them since the system is closed. Cash only. At that the husband starts wigging out..."haven't you heard...the Russians are fueling their missiles"..and because we don't take a credit card their family will be without water.
It was at this point I begin thinking to myself..."and you just failed the end of the world". If the world really is ending a credit card will be worthless. Banking will be done. Gold...silver...will be the easiest and likely the only form of currency. At the bare minimum he should have been sticking a gun in my face demanding the barrels. He failed.
They threw their stuff in the car and left. Without the barrels they needed to survive. After gone I noticed they forgot a bunch of their items. They called a few days later that they would be back for them. They never returned.
Gold, silver, food, water, TP, medicine, ammo, weapons...possibly alcohol and cigarettes.