It is not only in politics that the wrong ideas are prospering, in economy too and they have a hard life. Forty years ago, the 3rd Mauroy government, after its reshuffle, announced measures which will be qualified as a rigor plan or as the “rigor turnaround”, along with a third realignment inside the European Monetary System. It is then interpreted by the opposition of the right as the recognition of the failure of the economic policy followed since the election of François Mitterrand and still today by a part of the left as a treason and the submission ...