Pedro Herrera-Catalán is a fifth-year Ph.D. candidate in Economics at the Autonomous University of Madrid (UAM). He holds a master's degree from the London School of Economics and a B.A. from the Catholic University of Peru. His research interests focus on industrial agglomeration, network externalities, and spatial interaction modelling. He is currently working on research that involves a sensitivity analysis of scale effects in origin-destination flow models using linear and nonlinear estimation methods.