This Ph.D. thesis analyses the emergence and properties of social mobile money, which is more than a simple means of payment but also a way to provide other services and to satisfy other needs. These new currencies contributes to local development, reemployment, they facilitate social and financial inclusions, according their objectives, their location and the type of organisations which develop them. This Ph.D thesis studies the necessary conditions for implementation, sustainability and efficiency of mobile social money.Cette thèse analyse les monnaies mobiles sociales qui offrent aux consommateurs une complémentarité d'usage par rapport au panel de moyens de paiement existants. Ces nouvelles monnaies répondent à des besoins économiques s...