Political will is determinant at the moment of implementing successfully the participatory budgeting, even when exists a modern legislation as that of the Dominican Republic and an institutional context pro-decentralization and participation as that of Uruguay; the mayors' political will ends up being a determinant for this mechanism of participative democracy. The principal risk of this trend is that participatory budgeting can be transformed into participative mechanisms co-opted by the representative actors, especially when civil society does not manage the processes, and the political will of their leaders is excessive, making the process mutate from the delegation of power to the renovation of concentration strategies of power and allowing clientary relations to be co-opted in participatory budgeting.