Slusky, David; Zeckhauser, Richard J. - 2020
. Humans exposed to sunlight produce vitamin D directly. This paper investigates how differences in sunlight, as measured over … several years across states and during the same calendar week, affect influenza incidence. We find that sunlight strongly …% increase in relative sunlight decreases the influenza index in September or October by 1.1 points on a 10-point scale. A second …