[1] CVS Hlth, Wellesley, MA 02481 USA
[2] Georgia State Univ, Atlanta, GA 30302 USA
[3] NBER, Atlanta, GA 30302 USA
[4] Univ Alabama, Tuscaloosa, AL 35487 USA
[5] Australian Natl Univ, Res Sch Econ, Canberra, ACT 2600, Australia
[6] NBER, Dept Econ Finance & Legal Studies, Cambridge, MA 02138 USA