An econometric study of the role of local income per capita in shaping both the supply and quality choices of private providers, as well as the quality of private provision across space and local household income, and a discussion of the possible implications of the imposition of regulations for supply and quality of child care, based on data from city of San Paulo from Brazil's decennial population census of 1991 and 2000, and School Census Data from 2000 and 2006