Actually, a lot of people still barter. I'm a skilled tradesman and I trade my skill for the skill of others. Plumbers, electricians, auto mechanics, barbers; just about any tradesman can barter their skills. Saves us money and helps builds good business relationships in some cases. All tough I don't know anyone who does it specifically to "stop feeding the monster".

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For a people who are free, and who mean to remain so, a well-organized and armed militia is their best security.
Thomas Jefferson