In Tanzania's Dar es Salaam region, street food vendors produce economic benefits beyond their families. Because street food vendors purchase local fresh foods, urban gardens and small-scale farms in the area have expanded. In the United States, street food vendors are credited with supporting New York City's rapid growth by supplying meals for the city's merchants and workers. Proprietors of street food in the United States have had a goal of upward mobility, moving from selling on the street to their own shops. However, in Mexico, an increase in street vendors has been seen as a sign of deteriorating economic conditions in which food vending is the only employment opportunity that unskilled labor who have migrated from rural areas to urban areas are able to find.