Cinco cuestionamientos y una recomendación a los autores del artículo “Una evaluación económica del Sistema TransMilenio”

The article “An economic evaluation of Transmilenio,” by Echeverry, Ibáñez and Moya (Revista de Ingeniería No. 21), evaluates economically Phase I of the Transmilenio project finding that it was largely negative for Colombian society. In this article I challenge from five points of view the methods and results in that article. I find that said evaluation is negatively biased, because the authors overestimated the costs and underestimated the benefits. Therefore, I re-estimate the evaluation finding that Transmilenio had a positive effect on Colombian society.