{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T09:52:32Z","timestamp":1791280352889,"version":"4.1.0"},"reference-count":18,"publisher":"Oxford University Press (OUP)","license":[{"start":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T00:00:00Z","timestamp":1788825600000},"content-version":"am","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:title>Summary<\/jats:title>\n                  <jats:p>This paper studies identification and doubly robust (DR) estimation of quantile treatment effects (QTEs) in difference-in-discontinuities (diff-in-disc) designs when a new treatment is introduced in the post period and a confounding discontinuous policy is present in both periods. We show that QTEs are point identified under a conditional stable-distributional-effect assumption for the confounding treatment, a restriction that is analogous to the distributional parallel trends assumption in the recent difference-in-differences literature. We then propose a DR estimator and inference procedure that remain valid when either the outcome regression or the propensity score model is correctly specified, while avoiding high-dimensional non-parametric adjustment for covariates in the local estimation setting. We establish asymptotic normality of the proposed estimator, and Monte Carlo simulations illustrate its double-robustness and good finite-sample performance. In an application to Italian municipal fiscal data, the estimates suggest that relaxing fiscal constraints increases deficits primarily over the lower and central portions of the distribution, shifting municipalities from surplus or near balance into moderate deficits\u2014a distributional pattern not captured by mean effects.<\/jats:p>","DOI":"10.1093\/ectj\/utag028","type":"journal-article","created":{"date-parts":[[2026,9,5]],"date-time":"2026-09-05T13:52:26Z","timestamp":1788616346000},"source":"Crossref","is-referenced-by-count":0,"title":["Quantile treatment effects in difference-in-discontinuities designs"],"prefix":"10.1093","author":[{"given":"Yingying","family":"Dong","sequence":"first","affiliation":[{"name":"Department of Economics, University of California, Irvine, 3151 Social Science Plaza , Irvine, CA 92697-5100 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,9,8]]},"reference":[{"key":"2026100605062371700_bib1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.3982\/QE1367","article-title":"Testing identifying assumptions in fuzzy regression discontinuity designs","volume":"13","author":"Arai","year":"2022","journal-title":"Quantitative Economics"},{"key":"2026100605062371700_bib2","doi-asserted-by":"crossref","first-page":"431","DOI":"10.1111\/j.1468-0262.2006.00668.x","article-title":"Identification and inference in nonlinear difference-in-differences models","volume":"74","author":"Athey","year":"2006","journal-title":"Econometrica"},{"key":"2026100605062371700_bib3","doi-asserted-by":"crossref","first-page":"615","DOI":"10.1080\/13504851.2021.2005236","article-title":"Geographic difference-in-discontinuities","volume":"30","author":"Butts","year":"2023","journal-title":"Applied Economics Letters"},{"key":"2026100605062371700_bib4","doi-asserted-by":"crossref","first-page":"200","DOI":"10.1016\/j.jeconom.2020.12.001","article-title":"Difference-in-differences with multiple time periods","volume":"225","author":"Callaway","year":"2021","journal-title":"Journal of Econometrics"},{"key":"2026100605062371700_bib5","first-page":"1","article-title":"nprobust: Nonparametric kernel-based estimation and robust bias-corrected inference","volume-title":"Journal of Statistical Software","author":"Calonico","year":"2019"},{"key":"2026100605062371700_bib6","doi-asserted-by":"crossref","first-page":"1093","DOI":"10.3982\/ECTA7880","article-title":"Quantile and probability curves without crossing","volume":"78","author":"Chernozhukov","year":"2010","journal-title":"Econometrica"},{"key":"2026100605062371700_bib7","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1111\/j.1468-0262.2007.00738.x","article-title":"Efficient semiparametric estimation of quantile treatment effects","volume":"75","author":"Firpo","year":"2007","journal-title":"Econometrica"},{"key":"2026100605062371700_bib8","doi-asserted-by":"crossref","first-page":"382","DOI":"10.1016\/j.jeconom.2012.02.004","article-title":"Quantile treatment effects in the regression discontinuity design","volume":"168","author":"Frandsen","year":"2012","journal-title":"Journal of Econometrics"},{"key":"2026100605062371700_bib9","doi-asserted-by":"crossref","first-page":"736","DOI":"10.1080\/07350015.2017.1421544","article-title":"Including covariates in the regression discontinuity design","volume":"37","author":"Fr\u00f6lich","year":"2019","journal-title":"Journal of Business & Economic Statistics"},{"key":"2026100605062371700_bib10","article-title":"Fuzzy difference-in-discontinuities: Identification theory and application to the Affordable Care Act","author":"Galindo-Silva","year":"2021"},{"issue":"3","key":"2026100605062371700_bib11","first-page":"1","article-title":"Do fiscal rules matter?","volume":"8","author":"Grembi","year":"2016","journal-title":"American Economic Journal: Applied Economics"},{"key":"2026100605062371700_bib12","doi-asserted-by":"crossref","first-page":"401","DOI":"10.1080\/07350015.2024.2388643","article-title":"Difference-in-differences estimator of quantile treatment effect on the treated","volume":"43","author":"Kim","year":"2025","journal-title":"Journal of Business & Economic Statistics"},{"key":"2026100605062371700_bib13","doi-asserted-by":"crossref","first-page":"33","DOI":"10.2307\/1913643","article-title":"Regression quantiles","volume":"46","author":"Koenker","year":"1978","journal-title":"Econometrica"},{"key":"2026100605062371700_bib14","doi-asserted-by":"crossref","first-page":"785","DOI":"10.1016\/j.jeconom.2007.05.013","article-title":"How do extended benefits affect unemployment duration? 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