TY - JOUR TI - How Much Should We Trust Differences-In-Differences Estimates? AU - M. Bertrand AU - Esther Duflo AU - Sendhil Mullainathan JO - The Quarterly Journal of Economics PY - 2004 VL - 119 IS - 1 DO - 10.1162/003355304772839588 UR - https://doi.org/10.1162/003355304772839588 ER -