I'm in the middle of reading Patriot - A Novel of Survival by James Wesley, Rawles (yes, that's how he writes his name) and while it appears he tries to be the next Tom Clancy I don't think he's even close, especially when he talks about survivors of an economic crash hauling around arms and legs in a shopping cart.
But a few of his other scenarios seem more believable ... like what happens when money loses its value due to hyperinflation, how people empty out all the grocery stores in a few days and how there will be survivors and, well ... non-survivors.