Source: http://sesalaprovidence.free.fr/1ere/Chapitre%205%20%20La%20monnaie%20et%20le%20financement%20de%20l%E2%80%99%C3%A9conomie/Chapitre%205%20La%20monnaie%20et%20le%20financement%20de%20l%E2%80%99%C3%A9conomie.pdf