It was thought that the inflation issue was definitely over. During almost ten years, until the Covid-19 crisis, price increase in the developed countries had been very low, sometimes even negative to the point that central banks, with in the first position the European Central Bank, had re-interpreted their mandates: instead of acting to make inflation going down at a level inferior but near 2%, the ECB had reduced its rates and launched a massive public bonds purchase plan to make inflation rebounding to a level near but inferior to 2%. Everything has changed first with the sanitary crisis and ...