During the 19th CTN Workshop, organized jointly by CORE (Université catholique de Louvain) and CEREC (Université Saint-Louis), Tom Truyts and Gilles Grandjean, seized the opportunity to ask some questions to the 4 keynote speakers: Francis Bloch (Université Paris 1), Andrea Galeotti (University of Essex), Jean Jacques Herings (Maastricht University), and Matthew Jackson (Stanford University).