Problems when workers' centers are established are also common: day laborers often continue to congregate in large numbers on the streets surrounding the day labor centers, refusing to leave the street and use the center; new problems can be created, including new crowds of homeless and substance abusers loitering near the center after hours, and large numbers of day laborers drawn from other areas to the streets surrounding the centers. Low levels of work at the centers, low wages, and problems with the job distribution system are also common.