National University of Colombia - Department of Economics, National University of Colombia - Management and Accounting School, affiliation not provided to SSRN, National University of Colombia - Department of Economics, National University of Colombia - Department of Economics, National University of Colombia - School of Management and Accounting, National University of Colombia - Department of Economics, National University of Colombia, National University of Colombia - Department of Economics, National University of Colombia, University of Pittsburgh, National University of Colombia - Department of Economics, National University of Colombia - Department of Economics and National University of Colombia - Department of Economics