CV Antonio Sergio Ribeiro Center for Management Studies of IST (CEG-IST), Technical University of Lisbon   António Ribeiro CEG-IST, DEG Avenida Rovisco Pais Lisbon, Lisbon 1050-001 Portugal   antonio.sergio.ribeiro@ist.utl.pt         Primary Research Focus: Labour economics; Sports Economics; Sport Sciences   JEL Areas: J3 : Wages, Compensation, and Labor Costs: General J6 : Mobility, Unemployment, and Vacancies: General