interesting. But I think that when things really do fall apart, long distance bartering will not be easy. I am thinking when the time comes to have bartering items to trade for things we might need like eggs, seeds, tools etc. My understanding is never barter from your home but have a place where people can set up from cars and wagons if need be to do the trading. The hard part will be how much items are worth in order to get good trade deals. I have been compiling a list of things that would be good for bartering. When I have more time I will post it.
