In Mexico City, there are 1,066 officially recognized tianguis controlled by 600 tianguis associations, each of whom has between forty and six hundred members. Hundreds of these close entire streets at least one day a week. These tianguis employ about 130,000 people. These markets are regulated by the Secretaria de Desarrollo Economico and by the Secretaria de Economia Federal. Most tianguis vendors are located in the borough of Iztapalapa, where they make up about one third of the total. This borough contains 304 tianguis markets convene during the week with Gustave A. Madero coming second with 160. Sunday is the busiest day for tianguis, and Tuesday is the slowest.