I think the problems would be worse for the developed world. In South Africa we straddle first and third world economies. In my own life this is well illustrated. I have a secondhand shop, which I am trying to keep a cash business. I also sell online, to customers all over the world.

I think the best way to prepare is to cultivate relationships. After having had a small business in the same town for over 25 years, I would quickly start to barter. It is worth remembering  how your reputation will carry you through in a situation like this.