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The Journal of The Journal of Economic Perspectives Economic Perspectives The Journal of Spring 2021, Volume 35, Number 2 Economic Perspectives Symposia European Union Philip R. Lane, “The Resilience of the Euro” Keith Head and Thierry Mayer, “The United States of Europe: A Gravity Model Evaluation of the Four Freedoms” David Dorn and Josef Zweimüller, “Migration and Labor Market Integration in Europe” Florin Bilbiie, Tommaso Monacelli, and Roberto Perotti, “Fiscal Policy in Europe: Controversies over Rules, Mutual Insurance, and Centralization” Preventive Medicine A journal of the Joseph P. Newhouse, “An Ounce of Prevention” American Economic Association Amanda E. Kowalski, “Mammograms and Mortality: How Has the Evidence Evolved?” Spring 2021 Volume 35, Number 2 Spring 2021 Volume Articles M.V. Lee Badgett, Christopher S. Carpenter, and Dario Sansone, “LGBTQ Economics” Nicolás Campos, Eduardo Engel, Ronald D. Fischer, and Alexander Galetovic, “The Ways of Corruption in Infrastructure: Lessons from the Odebrecht Case” Benjamin F. Jones, “The Rise of Research Teams: Benets and Costs in Economics” Feature Timothy Taylor, “Recommendations for Further Reading” Spring 2021 The American Economic Association The Journal of Correspondence relating to advertising, busi- Founded in 1885 ness matters, permission to quote, or change Economic Perspectives of address should be sent to the AEA business EXECUTIVE COMMITTEE office: [email protected]. Street ad- Elected Officers and Members A journal of the American Economic Association dress: American Economic Association, 2014 Broadway, Suite 305, Nashville, TN 37203. For President membership, subscriptions, or complimentary DAVID CARD, University of California, Berkeley Editor access to JEP articles, go to the AEA website: Heidi Williams, Stanford University http://www.aeaweb.org. 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OTHER OFFICERS Copyright © 2021 by the American Economic Association; All Rights Reserved. Director of AEA Publication Services Composed by American Economic Association Publications, Pittsburgh, Pennsylvania, USA. Printed by LSC Communications, Owensville, Missouri, 65066, USA. ELIZABETH R. BRAUNSTEIN No responsibility for the views expressed by the authors in this journal is assumed by the editors or by Counsel the American Economic Association. LAUREN M. GAFFNEY, Bass, Berry & Sims PLC THE JOURNAL OF ECONOMIC PERSPECTIVES (ISSN 0895-3309), Spring 2021, Vol. 35, No. 2. The JEP is published quarterly (February, May, August, November) by the American Economic Association, 2014 Nashville, TN Broadway, Suite 305, Nashville, TN 37203-2418. Annual dues for regular membership are $24.00, $34.00, ADMINISTRATORS or $44.00 depending on income; for an additional $15.00, you can receive this journal in print. The journal is freely available online. For details and further information on the AEA go to https://www.aeaweb.org/. Director of Finance and Administration Periodicals postage paid at Nashville, TN, and at additional mailing offices. BARBARA H. FISER POSTMASTER: Send address changes to the Journal of Economic Perspectives, 2014 Broadway, Suite 305, Convention Manager Nashville, TN 37203. Printed in the U.S.A. GWYN LOFTIS The Journal of Economic Perspectives Contents Volume 35 • Number 2 • Spring 2021 Symposia European Union Philip R. Lane, “The Resilience of the Euro” ..............................3 Keith Head and Thierry Mayer, “The United States of Europe: A Gravity Model Evaluation of the Four Freedoms” ........................23 David Dorn and Josef Zweimüller, “Migration and Labor Market Integration in Europe” .................................................49 Florin Bilbiie, Tommaso Monacelli, and Roberto Perotti, “Fiscal Policy in Europe: Controversies over Rules, Mutual Insurance, and Centralization” ..............................................77 Preventive Medicine Joseph P. Newhouse, “An Ounce of Prevention” .......................... 101 Amanda E. Kowalski, “Mammograms and Mortality: How Has the Evidence Evolved?” ................................................. 119 Articles M.V. Lee Badgett, Christopher S. Carpenter, and Dario Sansone, “LGBTQ Economics” ............................................... 141 Nicolás Campos, Eduardo Engel, Ronald D. Fischer, and Alexander Galetovic, “The Ways of Corruption in Infrastructure: Lessons from the Odebrecht Case” ....................................... 171 Benjamin F. Jones, “The Rise of Research Teams: Benefits and Costs in Economics” ................................................ 191 Feature Timothy Taylor, “Recommendations for Further Reading” ................. 217 Statement of Purpose The Journal of Economic Perspectives attempts to fill a gap between the general interest press and most other academic economics journals. The journal aims to publish articles that will serve several goals: to synthesize and integrate lessons learned from active lines of economic research; to provide economic analysis of public policy issues; to encourage cross-fertilization of ideas among the fields of economics; to offer readers an accessible source for state-of-the-art economic thinking; to suggest directions for future research; to provide insights and read- ings for classroom use; and to address issues relating to the economics profession. Articles appearing in the journal are normally solicited by the editors and associate editors. Proposals for topics and authors should be directed to the journal office, at the address inside the front cover. Policy on Data Availability It is the policy of the Journal of Economic Perspectives to publish papers only if the data used in the analysis are clearly and precisely documented and are readily available to any researcher for purposes of replication. Details of the computations sufficient to permit replication must be provided. The Editor should be notified at the time of submission if the data used in a paper are proprietary or if, for some other reason, the above requirements cannot be met. Policy on Disclosure Authors of articles appearing in the Journal of Economic