Contre-productivité
The threshold beyond which a tool or institution begins to produce the opposite of its purpose: the school that stupefies, transport that paralyzes, medicine that sickens. In *La Convivialité*, Illich calls this the *« second threshold of mutation »*—the point where, beyond a certain degree of growth, the tool ceases to serve man and instead manipulates him. He would later formalize the term *« counter-productivity »* (notably in *Medical Nemesis*), but the concept is already fully described here: not merely diminishing returns, but a reversal of the tool against its very reason for being.
En une décennie plusieurs institutions dominantes ont, ensemble, sauté gaillardement le second seuil. L’école n’est plus un bon outil d’éducation, ni la voiture un bon outil de transport, ni la chaîne de montage un mode acceptable de production. L’école produit des cancres et la vitesse dévore le temps.
Illich identifies two thresholds in the life of a tool. At the first, the instrument becomes effective: by around 1913, medicine begins to cure more often than it harms. At the second, something flips. As the tool continues to grow, it crosses a “second threshold of mutation” beyond which the institution “perverts the use of the manageable tool”: “The means increasingly becomes the end.” Schools start producing failures, cars devour the time they promised to save, medicine manufactures new diseases. The purpose reverses into its opposite.
The term posterity will remember—counterproductivity—isn’t yet written here; Illich speaks of the “second threshold,” the moment when the institution “perverts the use of the manageable tool” and ushers in “the reign of manipulations.” But the idea is fully present, and precise: it’s not that the tool produces less, but that it produces the opposite. The same principle underpins conviviality: a society is convivial as long as it keeps its tools below this threshold, where they still extend the freedom of those who use them. Judging a means not by its output but by what it does to the fabric of relationships—this is the demand of any ecology of action.
Counterproductivity ≠ mere inefficiency or diminishing returns: the tool doesn’t perform its function “less well”—it achieves the inverse of its purpose. The institution meant to heal makes people sick. And it ≠ an accidental side effect: this isn’t an unforeseen failure but a structural threshold, predictable, inscribed in the very logic of the tool’s growth. Beyond this point, harm is no longer a machine malfunction—it is the product.