Thomas Porcher, a member of the group "Économistes atterrés" (the Appalled Economists), is one of the most important economists from France's left-wing. In this essay updated in 2024, he presents his vision of economics, a far cry from dominant trends, and debunks all preconceived ideas about our economic models, the better to fuel debate. His book shows a way forward for people and countries eager to change the way they think about economics.