Have a primary care physician, live longer
This study claims that more primary care means less mortality:
Analyses at the county level show lower mortality rates where there are more primary care physicians, but this is not the case for specialist supply. These findings confirm those of previous studies at the state and other levels. Increasing the supply of specialists will not improve the United States’ position in population health relative to other industrialized countries, and it is likely to lead to greater disparities in health status and outcomes.