Local and complementary currency

What is called "social and complementary currency" (or MCC in French for Monnaie Communautaire Complémentaire) is an exchange process, payment tool, organized around a specific unit of account, allowing sharetakers to exchange goods and servicesn, and which is used on top of the official monetary system of the country (Dollar, euro, …). Largely ignored from the leading economic sciences, these currencies hold an important place in the research for alternative economic models, and raises more and more interest from local actors.
In the France, they are embedded in the movement of social and solider economy, but it is a world-wide phenomenon, noticeable among others in South America, in North America, in Europe and in Asia (in Japan). If the innovations abound, particularly since the 80’s, their real impact is still marginal, as well in economic, social or environmental field.