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Linear regressions with period and group fixed effects are widely used toestimate policies' effects: 26 of the 100 most cited papers published by theAmerican Economic Review from 2015 to 2019 estimate such regressions. It hasrecently been shown that those regressions may produce misleading estimates, ifthe policy's effect is heterogeneous between groups or over time, as is oftenthe case. This survey reviews a fast-growing literature that documents thisissue, and that proposes alternative estimators robust to heterogeneouseffects. We use those alternative estimators to revisit Wolfers (2006).

Two-Way Fixed Effects and Differences-in-Differences with Heterogeneous Treatment Effects: A Survey