The street sellers of Tepito and other parts of the city form a large part of the financing of political parties in Mexico City. The Party of the Democratic Revolution has governed the city since 2000 and the charge to these vendors to ignore their activities can be anywhere from thirty pesos a week to 100 pesos a day during campaigns. When multiplied by the half million or so street vendors that are estimated in the city, it is a lot of "black money" for politicians.