Free Money
Description
"Given the determining role of interest, the first alternative currency system to consider is one that structurally eliminates it. One such system, called Frei Geld or "free-money" was proposed in 1906 by Silvio Gesell in The Natural Economic Order. Gesell's free-money bears a form of negative interest called Demurrage. Periodically, a stamp costing a tiny fraction of the currency's denomination must be affixed to it, in effect a "user fee" or a "maintenance cost"; another way to look at it is that the currency "goes bad" – depreciates in value – as it ages." (http://realitysandwich.com/money_a_new_beginning_part_2)