Article dans une revue: This set of three papers is derived from the training session on the predatory strategies organised by Concurrences Review that has held on 5th July 2010 in Paris. The first paper is a short introduction of the Economist Etienne Pfister presenting the preemptive strategies and how these practices are considered by competition authorities. The second paper of Professor David Spector concentrates on margin squeeze. Finally, the third paper, written by Me Olivier Fréget, is dedicated to the treatment of these predatory strategies under section 102 TFEU.