Subject(s): Sociology -- Urban in California in San Francisco Metropolitan Area -- City and town life -- urban medical practice -- informal economy -- Informal city approach -- Informal space -- Urban planning -- Socio-political phenomenon -- Social space -- Informal economy -- Street vendors -- Invisible labourers and firm -- Visible labourers and firm -- Informality and urban politics -- Ethnic factor -- Informal organizations -- Informality, interstitiality and modern firm -- Informality and urban medical practices -- Informal arena of inter-ethnic relations power and informality -- Minority communities and majority Community