^^^ People are still here, in spite of the past. So, if all the world's money systems failed in the past, there must be something that works that is not a money system. Otherwise people would be gone, too. Could it be barter?

They have never experience a depression like the 2030`s depression that is about to happen. Yes all of the world`s money systems have failed look at history, there is not one that has not.
It is a Jenga tower they have built, one bad season of no rain or to much rain and all of the crops are dead and the world enters the dark ages again. One massive earthquake, one meteor, one polar shift, one big tsunami and everything is gone. There is no safety net on these types of problems we face. There could be if they used 1% of the military funding to start making backup houses,power, food and water for the working class.
How will you barter when there is 10,000`s that will group up and just take your shit, You won`t. It is not going to be like any other depression in history pal. Prepare yourself, buy some nice drones and attach some guns to them so you can shoot people off your property from the comfort for your living room, You will be living in that living room for a long time, I don`t think you can prepare your drone with enough ammo to defend for what is coming.