Economic science is frequently based on reasonings. They could reveal themselves right and the authorities which have taken the decisions which were based on them and their populations are taking the benefits. But they can also lead to failures with heavy consequences; this is not new and this not only regards France. A century ago, Keynes, then a member of the British delegation which was negotiating what will become the Versailles Treaty resigned because he thought that the sanctions imposed to Germany were too heavy and could send the country into a crisis. We know what happened after, with the ...