Economics sometimes works in strange and nonlinear ways. Ronald Coase’s seminal article (1937) gave its author one-half of his Nobel Prize, although it was not considered an important contribution until the late 1960s. Léon Walras, when he wrote his Éléments d’économie politique pure, was not at all a prophet in his own country. It is possible to multiply such examples. In this article, we want to show that an author’s true value may not be appreciated at the time of writing, even when that author is making an important contribution to demand theory.