Abstract
This article makes an exploration of microcredit from its beginning with the Grameen Bank and the methodology used by Muhammad Yunus. It presents a theoretical approximation of what the credit market is and the problems it has. It also analyses the model of solidarity groups and how they allow eliminating the asymmetries of the credit market and, finally, it presents an analysis of the Microcredit in Colombia regarding the amounts of placement and rates of interest since it has been formalized as Opportunities Banking policy.