Gulching, Barter, Local Currencies
Gulching:
http://en.wikipedia.org/wiki/Gulching (link is external)
http://www.backwoodshome.com/columns/wolfe040515.html (link is external)
http://gulcherslife.blogspot.com/2006/04/gulching-to-become-trendy.html (link is external)
Local Currency:
http://en.wikipedia.org/wiki/Local_currency (link is external)