Water Quality, Policy Diffusion Effects and Farmers’ Behavior
Author
Suggested Citation
Download full text from publisher
References listed on IDEAS
- Michael Greenstone & Rema Hanna, 2014.
"Environmental Regulations, Air and Water Pollution, and Infant Mortality in India,"
American Economic Review, American Economic Association, vol. 104(10), pages 3038-3072, October.
- Michael Greenstone & Rema Hanna, 2011. "Environmental Regulations, Air and Water Pollution, and Infant Mortality in India," NBER Working Papers 17210, National Bureau of Economic Research, Inc.
- Greenstone, Michael & Hanna, Rema, 2011. "Environmental Regulations, Air and Water Pollution, and Infant Mortality in India," Working Paper Series rwp11-034, Harvard University, John F. Kennedy School of Government.
- Michael Greenstone & Rema Hanna, 2011. "Environmental Regulations, Air and Water Pollution, and Infant Mortality in India," CID Working Papers 224, Center for International Development at Harvard University.
- Rema Hanna & Michael Greenstone, 2011. "Environmental Regulations, Air and Water Pollution, and Infant Mortality in India," Working Papers id:4309, eSocialSciences.
- Michael Greenstone & Rema Hanna, 2011. "Environmental Regulations, Air and Water Pollution, and Infant Mortality in India," Working Papers 1114, Massachusetts Institute of Technology, Center for Energy and Environmental Policy Research.
- Hanna, Rema N. & Greenstone, Michael, 2011. "Environmental Regulations, Air and Water Pollution, and Infant Mortality in India," Scholarly Articles 5131505, Harvard Kennedy School of Government.
- Tatyana Deryugina & Garth Heutel & Nolan H. Miller & David Molitor & Julian Reif, 2019.
"The Mortality and Medical Costs of Air Pollution: Evidence from Changes in Wind Direction,"
American Economic Review, American Economic Association, vol. 109(12), pages 4178-4219, December.
- Tatyana Deryugina & Garth Heutel & Nolan H. Miller & David Molitor & Julian Reif, 2016. "The Mortality and Medical Costs of Air Pollution: Evidence from Changes in Wind Direction," NBER Working Papers 22796, National Bureau of Economic Research, Inc.
- Stefan Ambec & Mark A. Cohen & Stewart Elgie & Paul Lanoie, 2013.
"The Porter Hypothesis at 20: Can Environmental Regulation Enhance Innovation and Competitiveness?,"
Review of Environmental Economics and Policy, Association of Environmental and Resource Economists, vol. 7(1), pages 2-22, January.
- Ambec, Stefan & Cohen, Mark A. & Elgie, Stewart & Lanoie, Paul, 2010. "The Porter Hypothesis at 20: Can Environmental Regulation Enhance Innovation and Competitiveness?," IDEI Working Papers 655, Institut d'Économie Industrielle (IDEI), Toulouse.
- Ambec, Stefan & Cohen, Mark A. & Elgie, Stewart & Lanoie, Paul, 2010. "The Porter Hypothesis at 20: Can Environmental Regulation Enhance Innovation and Competitiveness?," TSE Working Papers 10-215, Toulouse School of Economics (TSE).
- Ambec, Stefan & Cohen, Mark A. & Elgie, Stewart & Lanoie, Paul, 2011. "The Porter Hypothesis at 20: Can Environmental Regulation Enhance Innovation and Competitiveness?," RFF Working Paper Series dp-11-01, Resources for the Future.
- Stefan AMBEC & Mark A. COHEN & Stewart ELGIE & Paul LANOIE, 2010. "The Porter Hypothesis at 20: can Environmental Regulation Enhance Innovation and Competitiveness?," Cahiers de recherche 10-02, HEC Montréal, Institut d'économie appliquée.
- Ambec, Stefan & Cohen, Mark & Elgie, Stewart & Lanoie, Paul, 2010. "The Porter Hypothesis at 20: Can Environmental Regulation Enhance Innovation and Competitiveness?," LERNA Working Papers 10.14.320, LERNA, University of Toulouse.
- Stefan Ambec & Mark A. Cohen & Stewart Elgie & Paul Lanoie, 2010. "The Porter Hypothesis at 20: Can Environmental Regulation Enhance Innovation and Competitiveness?," CIRANO Working Papers 2010s-29, CIRANO.
- Clément de Chaisemartin & Xavier D'Haultfœuille, 2020.
"Two-Way Fixed Effects Estimators with Heterogeneous Treatment Effects,"
American Economic Review, American Economic Association, vol. 110(9), pages 2964-2996, September.
- Cl'ement de Chaisemartin & Xavier D'Haultf{oe}uille, 2018. "Two-way fixed effects estimators with heterogeneous treatment effects," Papers 1803.08807, arXiv.org, revised Mar 2020.
- Clément de Chaisemartin & Xavier D'Haultfoeuille, 2019. "Two-way Fixed Effects Estimators with Heterogeneous Treatment Effects," NBER Working Papers 25904, National Bureau of Economic Research, Inc.
- Delgado, Michael S. & Florax, Raymond J.G.M., 2015.
"Difference-in-differences techniques for spatial data: Local autocorrelation and spatial interaction,"
Economics Letters, Elsevier, vol. 137(C), pages 123-126.
- Michael S. Delgado & Raymond J.G.M. Florax, 2015. "Difference-in-Differences Techniques for Spatial Data: Local Autocorrelation and Spatial Interaction," Tinbergen Institute Discussion Papers 15-091/VIII, Tinbergen Institute.
- Chad Syverson, 2011.
"What Determines Productivity?,"
Journal of Economic Literature, American Economic Association, vol. 49(2), pages 326-365, June.
- Chad Syverson, 2010. "What Determines Productivity?," NBER Working Papers 15712, National Bureau of Economic Research, Inc.
- Charles F. Manski, 2013.
"Identification of treatment response with social interactions,"
Econometrics Journal, Royal Economic Society, vol. 16(1), pages 1-23, February.
- Charles F. Manski, 2010. "Identification of treatment response with social interactions," CeMMAP working papers CWP01/10, Centre for Microdata Methods and Practice, Institute for Fiscal Studies.
- Matteo Barigozzi & Christian Brownlees, 2019.
"NETS: Network estimation for time series,"
Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 34(3), pages 347-364, April.
- Matteo Barigozzi & Christian Brownlees, 2013. "Nets: Network Estimation for Time Series," Working Papers 723, Barcelona School of Economics.
- Barigozzi, Matteo & Brownlees, Christian T., 2018. "Nets: network estimation for time series," LSE Research Online Documents on Economics 90493, London School of Economics and Political Science, LSE Library.
- Matteo Barigozzi & Christian T. Brownlees, 2013. "Nets: Network estimation for time series," Economics Working Papers 1391, Department of Economics and Business, Universitat Pompeu Fabra.
- Jing Cai & Alain De Janvry & Elisabeth Sadoulet, 2015.
"Social Networks and the Decision to Insure,"
American Economic Journal: Applied Economics, American Economic Association, vol. 7(2), pages 81-108, April.
- Cai, Jing & de Janvry, Alain & Sadoulet, Elisabeth, 2013. "Social Networks and the Decision to Insure," MPRA Paper 46861, University Library of Munich, Germany.
- Susan Athey & Dean Eckles & Guido W. Imbens, 2018.
"Exact p-Values for Network Interference,"
Journal of the American Statistical Association, Taylor & Francis Journals, vol. 113(521), pages 230-240, January.
- Athey, Susan & Eckles, Dean & Imbens, Guido W., 2015. "Exact P-Values for Network Interference," Research Papers 3351, Stanford University, Graduate School of Business.
- Susan Athey & Dean Eckles & Guido W. Imbens, 2015. "Exact P-values for Network Interference," NBER Working Papers 21313, National Bureau of Economic Research, Inc.
- Athey, Susan & Eckles, Dean & Imbens, Guido W., 2015. "Exact P-Values for Network Interference," Research Papers 3287, Stanford University, Graduate School of Business.
- David A Keiser & Joseph S Shapiro, 2019.
"Consequences of the Clean Water Act and the Demand for Water Quality,"
The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 134(1), pages 349-396.
- Keiser, David A. & Shapiro, Joseph S., 2016. "Consequences of the Clean Water Act and the Demand for Water Quality," 2016 Annual Meeting, July 31-August 2, Boston, Massachusetts 235437, Agricultural and Applied Economics Association.
- Joseph S. Shapiro & David A. Keiser, 2017. "Consequences of the Clean Water Act and the Demand for Water Quality," Cowles Foundation Discussion Papers 2070R, Cowles Foundation for Research in Economics, Yale University, revised Jun 2018.
- Joseph S. Shapiro & David A. Keiser, 2017. "Consequences of the Clean Water Act and the Demand for Water Quality," Cowles Foundation Discussion Papers 2070, Cowles Foundation for Research in Economics, Yale University.
- David A. Keiser & Joseph S. Shapiro, 2017. "Consequences of the Clean Water Act and the Demand for Water Quality," NBER Working Papers 23070, National Bureau of Economic Research, Inc.
- David A. Keiser & Joseph S. Shapiro, 2017. "Consequences of the Clean Water Act and the Demand for Water Quality," Working Papers 17-07, Center for Economic Studies, U.S. Census Bureau.
- Guojun He & Shaoda Wang & Bing Zhang, 2020. "Watering Down Environmental Regulation in China," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 135(4), pages 2135-2185.
- Hunt Allcott, 2016. "Paternalism and Energy Efficiency: An Overview," Annual Review of Economics, Annual Reviews, vol. 8(1), pages 145-176, October.
- Alberto Abadie, 2005. "Semiparametric Difference-in-Differences Estimators," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 72(1), pages 1-19.
- Edward Miguel & Michael Kremer, 2004. "Worms: Identifying Impacts on Education and Health in the Presence of Treatment Externalities," Econometrica, Econometric Society, vol. 72(1), pages 159-217, January.
- Callaway, Brantly & Sant’Anna, Pedro H.C., 2021.
"Difference-in-Differences with multiple time periods,"
Journal of Econometrics, Elsevier, vol. 225(2), pages 200-230.
- Brantly Callaway & Pedro H. C. Sant'Anna, 2018. "Difference-in-Differences with Multiple Time Periods," Papers 1803.09015, arXiv.org, revised Dec 2020.
- JunJie Wu & Richard M. Adams & Catherine L. Kling & Katsuya Tanaka, 2004.
"From Microlevel Decisions to Landscape Changes: An Assessment of Agricultural Conservation Policies,"
American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 86(1), pages 26-41.
- Wu, JunJie & Adams, Richard M. & Kling, Catherine L. & Tanaka, Katsuy, 2004. "From Microlevel Decisions to Landscape Changes: An Assessment of Agricultural Conservation Policies," ISU General Staff Papers 200402010752581352, Iowa State University, Department of Economics.
- Wu, JunJie & Adams, Richard M. & Kling, Catherine L. & Tanaka, Katsuya, 2004. "From Microlevel Decisions to Landscape Changes: An Assessment of Agricultural Conservation Policies," Staff General Research Papers Archive 12519, Iowa State University, Department of Economics.
- James J. Heckman & Hidehiko Ichimura & Petra E. Todd, 1997. "Matching As An Econometric Evaluation Estimator: Evidence from Evaluating a Job Training Programme," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 64(4), pages 605-654.
- Avraham Ebenstein, 2012. "The Consequences of Industrialization: Evidence from Water Pollution and Digestive Cancers in China," The Review of Economics and Statistics, MIT Press, vol. 94(1), pages 186-201, February.
- Goodman-Bacon, Andrew, 2021. "Difference-in-differences with variation in treatment timing," Journal of Econometrics, Elsevier, vol. 225(2), pages 254-277.
- Brainerd, Elizabeth & Menon, Nidhiya, 2014.
"Seasonal effects of water quality: The hidden costs of the Green Revolution to infant and child health in India,"
Journal of Development Economics, Elsevier, vol. 107(C), pages 49-64.
- Elizabeth Brainerd & Nidhiya Menon, 2013. "Seasonal Effects of Water Quality: The Hidden Costs of the Green Revolution to Infant and Child Health in India," Working Papers 64, Brandeis University, Department of Economics and International Business School.
- Michael P. Leung, 2020. "Treatment and Spillover Effects Under Network Interference," The Review of Economics and Statistics, MIT Press, vol. 102(2), pages 368-380, May.
- Sun, Liyang & Abraham, Sarah, 2021.
"Estimating dynamic treatment effects in event studies with heterogeneous treatment effects,"
Journal of Econometrics, Elsevier, vol. 225(2), pages 175-199.
- Liyang Sun & Sarah Abraham, 2018. "Estimating Dynamic Treatment Effects in Event Studies with Heterogeneous Treatment Effects," Papers 1804.05785, arXiv.org, revised Sep 2020.
- Clément Imbert & John Papp, 2020. "Short-term Migration, Rural Public Works, and Urban Labor Markets: Evidence from India," Journal of the European Economic Association, European Economic Association, vol. 18(2), pages 927-963.
- Basak Bayramoglu & Raja Chakir & Anna Lungarska, 2020. "Impacts of Land Use and Climate Change on Freshwater Ecosystems in France [Impacts de l'usage des sols et du changement climatique sur les écosystèmes d'eau douce en France]," Post-Print hal-02619251, HAL.
- Thomas Barrios & Rebecca Diamond & Guido W. Imbens & Michal Kolesár, 2012.
"Clustering, Spatial Correlations, and Randomization Inference,"
Journal of the American Statistical Association, Taylor & Francis Journals, vol. 107(498), pages 578-591, June.
- Thomas Barrios & Rebecca Diamond & Guido W. Imbens & Michal Kolesar, 2010. "Clustering, Spatial Correlations and Randomization Inference," NBER Working Papers 15760, National Bureau of Economic Research, Inc.
- Imbens,Guido W. & Rubin,Donald B., 2015. "Causal Inference for Statistics, Social, and Biomedical Sciences," Cambridge Books, Cambridge University Press, number 9780521885881, January.
Most related items
These are the items that most often cite the same works as this one and are cited by the same works as this one.- Li, Daiyue & Jin, Yanhong & Cheng, Mingwang, 2024. "Unleashing the power of industrial robotics on firm productivity: Evidence from China," Journal of Economic Behavior & Organization, Elsevier, vol. 224(C), pages 500-520.
- Melnik, Walter & Smyth, Andrew, 2024. "R&D tax credits and innovation," Journal of Public Economics, Elsevier, vol. 236(C).
- Roth, Jonathan & Sant’Anna, Pedro H.C. & Bilinski, Alyssa & Poe, John, 2023.
"What’s trending in difference-in-differences? A synthesis of the recent econometrics literature,"
Journal of Econometrics, Elsevier, vol. 235(2), pages 2218-2244.
- Jonathan Roth & Pedro H. C. Sant'Anna & Alyssa Bilinski & John Poe, 2022. "What's Trending in Difference-in-Differences? A Synthesis of the Recent Econometrics Literature," Papers 2201.01194, arXiv.org, revised Jan 2023.
- Andrea Albanese & Adrián Nieto & Konstantinos Tatsiramos, 2022.
"Job Location Decisions and the Effect of Children on the Employment Gender Gap,"
CESifo Working Paper Series
9792, CESifo.
- Albanese, Andrea & Nieto Castro, Adrian & Tatsiramos, Konstantinos, 2022. "Job Location Decisions and the Effect of Children on the Employment Gender Gap," IZA Discussion Papers 15353, Institute of Labor Economics (IZA).
- Andrea Albanese & Adrian Nieto Castro & Konstantinos Tatsiramos, 2022. "Job Location Decisions and the Effect of Children on the Employment Gender Gap," LISER Working Paper Series 2022-05, Luxembourg Institute of Socio-Economic Research (LISER).
- Albanese, Andrea & Nieto, Adrián & Tatsiramos, Konstantinos, 2022. "Job Location Decisions and the Effect of Children on the Employment Gender Gap," GLO Discussion Paper Series 1113, Global Labor Organization (GLO).
- Dalia Ghanem & Pedro H. C. Sant'Anna & Kaspar Wuthrich, 2022.
"Selection and parallel trends,"
Papers
2203.09001, arXiv.org, revised Mar 2024.
- Dalia Ghanem & Pedro H. C. Sant'Anna & Kaspar Wüthrich, 2022. "Selection and Parallel Trends," CESifo Working Paper Series 9910, CESifo.
- Schoner, Florian & Mergele, Lukas & Zierow, Larissa, 2024.
"Grading student behavior,"
Labour Economics, Elsevier, vol. 90(C).
- Florian Schoner & Lukas Mergele & Larissa Zierow, 2021. "Grading Student Behavior," CESifo Working Paper Series 9275, CESifo.
- Schoner, Florian & Mergele, Lukas & Zierow, Larissa, 2022. "Grading Student Behavior," VfS Annual Conference 2022 (Basel): Big Data in Economics 264140, Verein für Socialpolitik / German Economic Association.
- Baker, Andrew C. & Larcker, David F. & Wang, Charles C.Y., 2022. "How much should we trust staggered difference-in-differences estimates?," Journal of Financial Economics, Elsevier, vol. 144(2), pages 370-395.
- Chen, Jidong & Shi, Xinzheng & Zhang, Ming-ang & Zhang, Sihan, 2024. "Centralization of environmental administration and air pollution: Evidence from China," Journal of Environmental Economics and Management, Elsevier, vol. 126(C).
- Shanxia Sun & Michael S. Delgado, 2024. "Local spatial difference-in-differences models: treatment correlations, response interactions, and expanded local models," Empirical Economics, Springer, vol. 67(5), pages 2077-2107, November.
- Hampton, Matt & McNamara, Scott, 2022. "The impact of educational rewards on the diagnosis of autism spectrum disorder," Economics & Human Biology, Elsevier, vol. 47(C).
- Michael Pollmann, 2020. "Causal Inference for Spatial Treatments," Papers 2011.00373, arXiv.org, revised Jan 2023.
- Aggarwal, Khushboo & Barua, Rashmi & Vidal-Fernandez, Marian, 2024. "Still Waters Run Deep: Groundwater Contamination and Education Outcomes in India," Economics of Education Review, Elsevier, vol. 100(C).
- Jaraitė, Jūratė & Kurtyka, Oliwia & Ollivier, Hélène, 2022.
"Take a ride on the (not so) green side: How do CDM projects affect Indian manufacturing firms’ environmental performance?,"
Journal of Environmental Economics and Management, Elsevier, vol. 114(C).
- Jūratė Jaraitė & Oliwia Kurtyka & Hélène Ollivier, 2022. "Take a ride on the (not so) green side: How do CDM projects affect Indian manufacturing firms’ environmental performance?," PSE-Ecole d'économie de Paris (Postprint) halshs-03705780, HAL.
- Jūratė Jaraitė & Oliwia Kurtyka & Hélène Ollivier, 2022. "Take a ride on the (not so) green side: How do CDM projects affect Indian manufacturing firms’ environmental performance?," Post-Print halshs-03705780, HAL.
- Julius Owusu, 2023. "Randomization Inference of Heterogeneous Treatment Effects under Network Interference," Papers 2308.00202, arXiv.org, revised Jan 2024.
- Mikhail Mamonov & Anna Pestova & Steven Ongena, 2023.
"“Crime and Punishment”? How Banks Anticipate and Propagate Global Financial Sanctions,"
CERGE-EI Working Papers
wp753, The Center for Economic Research and Graduate Education - Economics Institute, Prague.
- Mikhail Mamonov & Anna Pestova & Steven Ongena, 2023. "'Crime and Punishment'? How Banks Anticipate and Propagate Global Financial Sanctions," Swiss Finance Institute Research Paper Series 23-59, Swiss Finance Institute.
- Aibo Gong, 2021. "Bounds for Treatment Effects in the Presence of Anticipatory Behavior," Papers 2111.06573, arXiv.org, revised Dec 2022.
- Mark Kattenberg & Bas Scheer & Jurre Thiel, 2023. "Causal forests with fixed effects for treatment effect heterogeneity in difference-in-differences," CPB Discussion Paper 452, CPB Netherlands Bureau for Economic Policy Analysis.
- Claire Lepault, 2023. "Is urban wastewater treatment effective in India? Evidence from water quality and infant mortality," CIRED Working Papers hal-04232407, HAL.
- Isabelle Chort & Berk Öktem, 2024.
"Agricultural shocks, coping policies and deforestation: Evidence from the coffee leaf rust epidemic in Mexico,"
American Journal of Agricultural Economics, John Wiley & Sons, vol. 106(3), pages 1020-1057, May.
- Isabelle Chort & Berk Öktem, 2023. "Agricultural shocks, coping policies and deforestation: evidence from the coffee leaf rust epidemic in mexico," Working Papers hal-03715600, HAL.
- Isabelle Chort & Berk Öktem, 2023. "Agricultural shocks, coping policies and deforestation: Evidence from the coffee leaf rust epidemic in Mexico," Post-Print hal-04562445, HAL.
- Mounu Prem & Juan Vargas & Miguel E. Purroy, 2021.
"Landmines: The Local Effects of Demining,"
Empirical Studies of Conflict Project (ESOC) Working Papers
28, Empirical Studies of Conflict Project.
- Mounu Prem & Miguel Purroy & Juan F. Vargas, 2021. "Landmines: The local effects of demining," Documentos de Trabajo 19733, The Latin American and Caribbean Economic Association (LACEA).
- Prem, Mounu & Purroy, Miguel E. & Vargas, Juan F., 2021. "Landmines: The Local Effects of Demining," SocArXiv 3jzk6, Center for Open Science.
- Prem, M & Purroy, M. E. & Vargas, J. F., 2021. "Landmines: the local effects of demining," Documentos de Trabajo 19588, Universidad del Rosario.
- Prem, Mounu & Purroy, Miguel E. & Vargas, Juan F., 2022. "Landmines: the Local Effects of Demining," IAST Working Papers 22-132, Institute for Advanced Study in Toulouse (IAST).
- Prem, Mounu & Purroy, Miguel & Vargas, Juan F., 2024. "Landmines: The local effects of demining," CEPR Discussion Papers 18975, C.E.P.R. Discussion Papers.
- Mounu Prem & Miguel E. Purroy & Juan F. Vargas, 2021. "Landmines: The Local Effects of Demining," HiCN Working Papers 360, Households in Conflict Network.
- Prem, Mounu & Purroy, Miguel E & Vargas, Juan F., 2021. "Landmines: The Local Effects of Demining," Working papers 86, Red Investigadores de Economía.
- Prem, Mounu & Purroy, Miguel E. & Vargas, Juan F., 2022. "Landmines: the Local Effects of Demining," TSE Working Papers 22-1305, Toulouse School of Economics (TSE).
More about this item
Keywords
Policy Evaluation ; Diffusion Effects ; Water Pollution;All these keywords.
JEL classification:
- D04 - Microeconomics - - General - - - Microeconomic Policy: Formulation; Implementation; Evaluation
- D80 - Microeconomics - - Information, Knowledge, and Uncertainty - - - General
- Q01 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General - - - Sustainable Development
- Q25 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Renewable Resources and Conservation - - - Water
- Q53 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Air Pollution; Water Pollution; Noise; Hazardous Waste; Solid Waste; Recycling
NEP fields
This paper has been announced in the following NEP Reports:- NEP-ENV-2021-07-12 (Environmental Economics)
- NEP-REG-2021-07-12 (Regulation)
Statistics
Access and download statisticsCorrections
All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:tse:wpaper:125765. See general information about how to correct material in RePEc.
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: the person in charge (email available below). General contact details of provider: https://edirc.repec.org/data/tsetofr.html .
Please note that corrections may take a couple of weeks to filter through the various RePEc services.