Cognitive mechanisms are, paradoxically, quite confused when they rely on parsimony. It was the simplification, for instance, coming from the determinism of economic theory and practice, which gave a much too univocal sense to the economicity as a state of rationality, with the practice-theory construct being left only with the chance of limiting itself to the sense given by the principle of efficiency. The mathematical reduction to absurdity, transposed into the formula of ceteris paribus sic standibus in Economics, has favoured the linear relation and the materialist perspective in the understanding of economic action.