This paper uses an analysis of survey data from urban Californians to
determine whether patients' reports of access to care were associated
with physician supply. On unadjusted analyses, higher levels of physic
ian supply were associated with better access to care. However, this a
ssociation was no longer apparent after adjusting for underlying popul
ation characteristics such as insurance status, income, and race/ethni
city. Poorer access to care in communities with lower physician supply
appeared to be explained mainly by lack of health insurance and other
population characteristics rather than by physician supply. We conclu
de that a more geographically equitable distribution of physicians in
urban areas is unlikely to compensate for an inegalitarian system of h
ealth insurance.