This e-book collects selected chapters presented at the seminar of the European Association of Agricultural Economics "New dimensions of market power and bargaining in the agri-food sector: organisations, policies and models" which was held in June 2016 in Italy (Gaeta). The seminar gathered 103 scholars from 23 Countries worldwide and it was the result of the joint effort of the University of Cassino and Southern Lazio, the Technical University of Munich, Colorado State University, Scotland's Rural College, and the University College of Dublin. The chapters in this e-book provide an effective summary of the scientific debate.