{"type":"script","doc_desc":{"producers":[{"name":"Reproducibility WBG","abbr":"DECDI","affiliation":"World Bank - Development Impact Department","role":"Verification and preparation of metadata"}],"prod_date":"2026-05-22","version":"1"},"project_desc":{"authoring_entity":[{"name":"Daniel Felipe Lasso Jaramillo","affiliation":"World Bank","email":"dlassojaramillo@worldbank.org"}],"title_statement":{"title":"Reproducibility package for Spillover Gridlock: Revisiting Spillovers In Difference-In-Differences","idno":"RR_MEX_2026_665"},"data_statement":"All data is restricted and has not been included in the reproducibility package. For more details, please refer to the README file.","software":[{"name":"R","version":"4.5.2"}],"scripts":[{"title":"Reproducibility package for Spillover Gridlock: Revisiting Spillovers In Difference-In-Differences","date":"2026-05","notes":"Computational reproducibility verified by Development Impact (DECDI) Analytics team, World Bank.","instructions":"See README in reproducibility package.","file_name":"RR_MEX_2026_665","zip_package":"RR_MEX_2026_665.zip","dependencies":"R dependencies are listed in the file renv.lock."}],"repository_uri":[{"name":"Reproducible Research Repository (World Bank)","uri":"https:\/\/reproducibility.worldbank.org"}],"production_date":"2026-05-22","abstract":"I decompose the canonical Difference-in-differences (DiD) estimator in presence of spillovers into a weighted average of 2\u00d72 estimators that compare treated and untreated units across different levels of exposure to treatment. Identifying the ATT requires strong homogeneity conditions: that spillover magnitudes and exposure probabilities are both identical across treatment status, conditions unlikely to hold in observational studies. While a common response is to control for researcher-proposed interference structures, such estimators induce a selection bias if misspecified, a serious concern given the complex and unknown nature of interference. I propose instead spill-imputation, which identifies individual treatment and spillover effects under a unit-level parallel trends assumption \u2014weaker than correct specification of the interference structure\u2014 and recovers spillover heterogeneity ex-post, in a data-driven way. Monte Carlo simulations show deviations of up to 15% for parametric DiD against at most 0.1% for spill-imputation. An application to road paving in Mexico finds positive spillover effects of 19.5% on nearby unpaved plots\u2019 property values, and no heterogeneous effects along the distance to the amenity.","geographic_units":[{"name":"Mexico","code":"MEX"}],"keywords":[{"name":"Difference-In-Differences"},{"name":"Spillovers"},{"name":"Heterogeneity"},{"name":"Semi-Parametric Estimation"},{"name":"Individual Treatment Effects"}],"topics":[{"id":"C01","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Econometrics","parent_id":"C0"},{"id":" C13","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Estimation: General","parent_id":"C1"},{"id":" C14","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Semiparametric and Nonparametric Methods: General","parent_id":"C1"},{"id":" C33","uri":"https:\/\/www.aeaweb.org\/econlit\/jelCodes.php?view=jel","vocabulary":"Journal of Economic Literature (JEL)","name":"Panel Data Models \u2022 Spatio-temporal Models","parent_id":"C3"}],"output":[{"type":"Working Paper","description":"Policy Research Working Papers (PRWP)","title":"Spillover Gridlock: Revisiting Spillovers In Difference-In-Differences"}],"language":[{"name":"English","code":"EN"}],"disclaimer":"The materials in the reproducibility packages are distributed as they were prepared by the staff of the International Bank for Reconstruction and Development\/The World Bank. The findings, interpretations, and conclusions expressed in this event do not necessarily reflect the views of the World Bank, the Executive Directors of the World Bank, or the governments they represent. The World Bank does not guarantee the accuracy of the materials included in the reproducibility package.","license":[{"name":"MIT License","uri":"https:\/\/opensource.org\/license\/mit"},{"name":"World Bank IGO Rider","uri":"https:\/\/github.com\/worldbank\/metadata-editor\/blob\/main\/WB-IGO-RIDER.md"}],"contacts":[{"name":"Daniel Felipe Lasso Jaramillo","affiliation":"World Bank","email":"dlassojaramillo@worldbank.org"},{"name":"Reproducibility WBG","affiliation":"World Bank","email":"reproducibility@worldbank.org"}],"technology_environment":"Paper exhibits were reproduced on a computer with the following specifications:\n\u2022 OS: Windows 11 Enterprise\n\u2022 Processor: Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz (2.90 GHz) (2 processors)\n\u2022 Memory available: 16.0 GB","technology_requirements":"Runtime: 31 seconds","reproduction_instructions":"To reproduce the findings in this paper, a replicator must:\n1. **Secure Access to Data:** Access the datasets not included in the package. See the Datasets section for more details.\n2. **Run the Package:** Update the working directory in line 41 of the R file `master`, and run it.\n\nSince all the original data cannot be redistributed, the package includes the outputs produced by the replicators, which can be used to review the results presented in the paper.\n","datasets":[{"name":"Household survey data ","note":"Source: Gonz\u00e1lez-Quintana et al. (Institute of Labor Economics (IZA) Discussion Paper No. 18082).\nAccessed: 2025. \nDescription: Household survey data: baseline, follow up and treatment assignment. File name and location: Data\/ALSS_data.csv.\nData URL: https:\/\/www.iza.org\/publications\/dp\/18082\/local-public-goods-and-property-tax-compliance-experimental-evidence-from-street-pavement.\n","access_type":"Data access was granted directly to the study authors by the data owners\/managers. It was obtained with a custom data license that does not allow for redistribution and it is not included in the reproducibility package.","license":"Custom license","citation":"Gonz\u00e1lez-Quintana et al. (Institute of Labor Economics (IZA) Discussion Paper No. 18082). Household survey data and experimental streets shapefile (2025). [dataset]. Unpublished data. Accessed 2025."},{"name":"Experimental streets shapefile","note":"Source: Gonz\u00e1lez-Quintana et al. (Institute of Labor Economics (IZA) Discussion Paper No. 18082).\nAccessed: 2025.\nDescription: the dataset originates from unpublished IZA Discussion Paper: Local Public Goods and Property Tax Compliance: Experimental Evidence from Street Pavement. It contains Street Level Shapefiles: Polyline shapefile of experimental streets in the study area, with attributes for paving year and paving status. Coordinate reference system: WGS84 (EPSG:4326). \nFile name and location: Data\/Shapefiles\/Experimental_streets.shx, Experimental_streets.dbf; Experimental_streets.prj, Experimental_streets.sbn, Experimental_streets.sbx; Experimental_streets.shp.\nData URL: https:\/\/www.iza.org\/publications\/dp\/18082\/local-public-goods-and-property-tax-compliance-experimental-evidence-from-street-pavement","access_type":"Data access was granted directly to the study authors by the data owners\/managers. It was obtained with a custom data license that does not allow for redistribution and it is not included in the reproducibility package.","license":"Custom license","citation":"Gonz\u00e1lez-Quintana et al. (Institute of Labor Economics (IZA) Discussion Paper No. 18082). Household survey data and experimental streets shapefile (2025). [dataset]. Unpublished data. Accessed 2025."}]},"datacite":{"creators":[{"givenName":"Daniel Felipe Lasso","familyName":"Jaramillo","nameType":"Personal","affiliation":[{"name":"World Bank","affiliationIdentifier":"https:\/\/ror.org\/00ae7jd04","affiliationIdentifierScheme":"ROR","schemeUri":"https:\/\/ror.org"}]}],"titles":[{"lang":"en","title":"Reproducibility package for Spillover Gridlock: Revisiting Spillovers In Difference-In-Differences"},{"title":"RR_MEX_2026_665","titleType":"Other"}],"publisher":"World Bank","publicationYear":"2026","types":{"resourceType":"Reproducibility package","resourceTypeGeneral":"Other"},"url":"https:\/\/reproducibility.worldbank.org\/index.php\/catalog\/study\/RR_MEX_2026_665","language":"en"},"tags":[{"tag":"DOI"},{"tag":"Open Code"},{"tag":"Restricted Data"}],"schematype":"script"}