America coefficient of the day
We find that as the county unemployment rate increases by 1 percentage point, the opioid death rate (per 100,000) rises by 0.19 (3.6%) and the ED visit rate for opioid overdoses (per 100,000) increases by 0.95 (7.0%).
That is from a new NBER working paper by Alex Hollingsworth, Christopher J. Ruhm, and Kosali Simon.