In a theoretical first part we attempt to articulate the notions of concession, refutation and negation for monological linguistic activity, on the basis among other things of Mœschler's work on conversation. We distinguish the illocutionary act of refutation and the complex intervention of refutation, concession-invention, concession-repetition and concession-quotation. In a second part we analyze the place and role of (descriptive) negation in counter-argumentative texts written by 8- to 12-year-old pupils and adults in an artificial situation. We consider phenomena observed by (...) certain “contradictory” properties of negation in the context of the task in question: namely potential help in generating content by mechanisms of the argumentative law of negation extended to predicates, negation takes the risk polyphonically of argumentative drift. This may explain the fact that it is so rare. (shrink)