A persistent very low inflation rate is worrying. It is a paradox because during decades, governments have taken up a price stability target and central banks had as a mission to act to reach it. We still had, in Europe, the remembrance of the consequences of the German crisis in the Twenties which has not been without relation with the Nazism rise. Today, we are in the opposite situation. Central banks have interpreted their mandate in the opposite direction from what was foreseen at the origin. Instead of adopting monetary policies having as an objective to reduce prices increase to ...