An opportunity exists for growth of a large underground economy, using other than the Federal Reserve currency as a medium of exchange. Old silver of all kinds, perhaps commodities, either from supplies already squirrelled away or home-grown, useful tools (manual tools would command a premium), or exchange of labor for goods or other services.
This is probably the normal way of life for much of the world right now. For those of you who want a simpler and less complicated life. Did not say it would be easier.
Goodwill Stores could shift gears and become a store barter center.