Primitive art objects that have long been sold for derisory sums are getting more and more expensive owing to their entry into classified art and to their ever growing rarity. The ethnologist who pays attention to discourses and practices of art market actors in their daily life cannot and does not want to answer the trivial but central question: “how much is it worth?”; but when analyzing the histories of these objects she can seize the interactions by which these “things” liable to enter a collection become objects of desire for art lovers and acquire a market value. From her interviews with Parisian art dealers, brokers, collectors (Paris is a world-famous exchange place of art objects) the authorin tries to answer the question of the valorization of these objects coming from somewhere else.