Do public health activities pay for themselves? The effect of county‐level public health expenditures on county‐level public assistance medical care benefits in California

This study estimates the effect of county‐level public health expenditures in reducing county‐level public assistance medical care benefits (public assistance medical care benefits is a measure compiled by the US Bureau of Economic Analysis and includes Medicaid and other medical vendor payments). The effect is modeled using a static panel model and estimated using two‐stage limited information maximum likelihood and a valid instrumental variable. For every $1 invested in county‐level public health expenditures, public assistance medical care benefits are reduced by an average of $3.12 (95% confidence interval: −$5.62, −$0.94). Because Medicaid in California is financed via an approximate 50% match of federal dollars with state dollars, savings to the state are approximately one‐half of this, or $1.56 for every $1 invested in county‐level public health expenditures.