The French economics community of the latter half of the nineteenth century welcomed neither the first marginalist writings of W.S. Jevons, C . Menger and L. Walras nor, in general, the theoretical investigations to which they gave rise. The work of Augustin Cournot and Jules Dupuit, it is true, might have been expected to pave the way in changing attitudes, but, until the end of the 1860s, the French economists showed little interest in these contributions.