In this article the following topics will be discussed: the idea and the reason why this notion of the Social Market economy has been created. The influence of Müller-Armack and Ludwig Erhard will be discussed, but the idea will also be compared with the ideas of Neoliberalism and Ordoliberalism. The meaning of Equality, Value and Merit, redistribution of income, justitia distributiva and justitia commutativa and poverty will be discussed in the framework of the idea of social market economy; In this matter the role of Röpke and Rüstow will be explained as well as the (lateral) influence of Keynes. In the conclusion the future will also being scrutinised.