Juan M.C. Larrosa Department of Economics - Universidad Nacional del Sur   San Andres 800 - Altos de Palihue Bahía Blanca, Buenos Aires 8000FTN Argentina   jlarrosa@uns.edu.ar   https://orcid.org/0000-0002-0102-9994           JEL Areas: D4 : Market Structure and Pricing: General C3 : Multiple or Simultaneous Equation Models: General