Economy is not an exact science. Its constraints never completely erase the freedom of the decision-makers. This is why economy should again become political, in order to illustrate the paths and choices that are possible in function of goals brought to the surface by society and the State. A working tool for the student as well as an analytical tool for the decision-maker.Having received their diplomas from the National School of Administration (ENA) and served as counselors in the Cour des Comptes, Francois Hollande and Pierre Moscovici are now professors at the Institute of Political Study in Paris (Sciences-Po).