U.S. and IAEA officials say they believe North Korea procured the P-2-style centrifuge designs from A.Q Khan following a barter trade conducted in the 1990s.

WSJ: North Korea Nuclear Find Raises Fears It Will Share With Iran

Note: Be sure you are comfortable with the complexities barter can introduce into your life and be up-front with your trade partner on the legalities.

FORBES: Bartering for Survival - Have I Got A Deal for You

Chasen's barter idea: Buy discounted magazine and newspaper ad pages in bulk and trade them to restaurants for dining credits, which would then be sold to diners for cash.

FORBES: No Free Lunch

As soon as an American wanted to trade with a Japanese person, they would have to strike a fair barter.

FORBES: The Benefits of Free Trade Agreements: The Country Always Wins

The origin of money is a market-led response to barter costs, in which the best money is that which minimises the costs of trade.

ECONOMIST: Free exchange

In what Mr Audrines describes as a barter arrangement (in which the Cubans seem to get the rough end), Caracas will trade them for eight macaws, two tapirs, a puma and four capybaras.

ECONOMIST: Venezuela and Cuba