Das J, Hammer J, Location, location, location: Residence, wealth, and the quality of medical care in Delhi, India, 2007: Health Affairs, Vol: 26, No: 3, p338-351.

This study measures the competence of providers—the frontier of care that patients actually receive in seven neighborhoods of Delhi. The purpose is to see to what extent the knowledge of providers constrains quality and to what extent the competence of providers visited differs between poor and rich people. This paper shows that providers visited by the poor were indeed less knowledgeable than those visited by the rich.