RT Journal Article SR Electronic T1 Schools, Job Flexibility, and Married Women’s Labor Supply JF Journal of Human Resources FD University of Wisconsin Press SP 1295 OP 1319 DO 10.3368/jhr.0822-12507R1 VO 61 IS 4 A1 Hansen, Benjamin A1 Sabia, Joseph J. A1 Schaller, Jessamyn YR 2026 UL http://jhr.uwpress.org/content/61/4/1295.abstract AB This study examines the employment effects of a large shock to mothers’ childcare costs generated by changes in the availability of in-person K–12 instruction during the COVID-19 pandemic. We proxy for school attendance using smartphone data from SafeGraph. Using a difference-in-differences approach, we find K–12 reopenings are associated with increases in employment and hours among married women with school-aged children, with no measurable effects for childless women, custodial fathers, or unmarried women. Event-study analyses are consistent with a causal interpretation. Major activity responses show reductions in the reported likelihood of remaining out of the labor force to engage in caregiving.