In a general climate of uncertainty and even concern, central bank action is at the centre of attention. In accordance with their mandate, it contributes to the restoration of economic equilibrium by effectively combating inflation. It also influences the evolution of the financial markets and is therefore an essential element of the economic policies of States. The two main central banks of the developed world, the Federal Reserve in Washington and the European Central Bank, have pursued expansionary policies of money creation to deal with the crisis caused by the Covid-19 epidemic. The Chinese central bank, for its part, has ...