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This article triggered my memory and with a little help of my friend Tian, I stumbled on the Community Exchange System (CES) (Read here) - quite an innovative way to look at local currencies. The website makes the following claim: "With the impending implosion of the usury-based, global money system, now is the time to seek a new way of 'doing' money, one not based on debt and controlled by a global monetary elite that seems happy about destroying our planet in the pursuit of profit." The creator of this system is a guy called: Tim Jenkins. (One of the interesting stories about him, is that he escaped from a high security jail as a political activist with a key that he carved from wood!). Download this story here.
The use of and the likelihood that money/currency may change does exist. It may only happen in niche areas or for specific uses (like in the retail environment). By digitising alternative currencies and making them available through a mobile transacting platform, the use may become more prevalent. Just another wild thought.