“…Leland, 1998, Ericsson, 2000, Titman and Tsyplakov, 2002, Mauer and Sarkar, 2005, Childs et al, 2005, being particularly relevant the differences with Leland (1998), since the author do not take into account operational component of the agency costs. The differences are most likely linked with the time constraints for the investment option and the concession, because as the results demonstrate there is a positive relationship between the life of the investment option and of the concession and the agency costs of debt (more pronounced for the case of the life of the concession).…”