How access to addictive drugs affects the supply of substance abuse treatment: Evidence from Medicare Part D
利用Medicare D部分实施作为处方阿片类药物可及性增加的外生冲击，发现该政策导致各州药物滥用治疗设施、床位和药物辅助治疗供给显著增加，表明美国治疗供给能响应需求变化。
This paper documents how substance abuse treatment (SAT) providers and services respond to increases in population-level opioid addiction. I do this by exploiting the implementation of Medicare Part D as an exogenous increase in the availability of prescription opioids. Starting in 2006, states with higher shares of the population eligible for Medicare Part D experienced increases in residential and hospital inpatient SAT facilities, beds dedicated to SAT, and SAT facilities offering medication-assisted treatment, relative to states with lower shares. These results suggest that the supply of SAT in the United States is capable of responding significantly to changes in demand.