Jean-Pierre Voyer  Jean-Pierre Voyer (born 1938, Bolbec) is a post-situationist French philosopher. His main thesis is the non-existence of economy, and he claims to be inspired by Hegel and Marx, although he is very critical of the latter. He criticizes utilitarianism. Jorion has also published in the Revue de Mauss, a French anti-utilitarian journal.