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We combine LPs with a flexible \u201cclean control\u201d condition to define appropriate sets of treated and control units. Our proposed LP\u2010DiD estimator can be implemented with various weighting and normalization schemes for different target estimands, can be extended to include covariates or accommodate nonabsorbing treatment, and is simple and fast to implement. A simulation and two empirical applications demonstrate that the LP\u2010DiD estimator performs well in common applied settings.<\/jats:p>","DOI":"10.1002\/jae.70000","type":"journal-article","created":{"date-parts":[[2025,7,19]],"date-time":"2025-07-19T09:54:06Z","timestamp":1752918846000},"page":"741-758","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":82,"title":["A Local Projections Approach to Difference\u2010in\u2010Differences"],"prefix":"10.1002","volume":"40","author":[{"given":"Arindrajit","family":"Dube","sequence":"first","affiliation":[{"name":"Department of Economics University of Massachusetts  Amherst Massachusetts USA"},{"name":"NBER  Cambridge Massachusetts USA"},{"name":"IZA  Durham North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniele","family":"Girardi","sequence":"additional","affiliation":[{"name":"Department of Political Economy King's College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00d2scar","family":"Jord\u00e0","sequence":"additional","affiliation":[{"name":"Federal Reserve Bank of San Francisco  San Francisco California USA"},{"name":"Department of Economics University of California  Davis California USA"},{"name":"CEPR  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alan M.","family":"Taylor","sequence":"additional","affiliation":[{"name":"NBER  Cambridge Massachusetts USA"},{"name":"CEPR  London UK"},{"name":"Columbia University  New York New York USA"},{"name":"Bank of England  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,7,19]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1086\/700936"},{"key":"e_1_2_11_3_1","doi-asserted-by":"crossref","unstructured":"Alloza M. 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