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Published and Forthcoming Papers

"How the Other Half Died: Immigration and Mortality in US Cities", [CEPR dp] [NBER wp] (joint with James Feigenbaum, Casper Worm Hansen, and Hui Ren Tan). Review of Economic Studies, 2024, 94 (1), pp. 1-44. Media: [Frankfurter Allgemeine Sonntagszeitung (in German)]

"School Closures During the 1918 Flu Pandemic", [CEPR dp] [NBER wp] (joint with Katherine Eriksson, Ezra Karger, Peter Nencka, and Melissa Thomasson). Review of Economics and Statistics,  2024, 106 (1), pp. 266-276.


"The Effect of Immigration Restrictions on Local Labor Markets: Lessons from the 1920s Border Closure", [CEPR dp] [NBER wp] (joint with Ran Abramitzky, Leah Boustan, Elior Cohen, and Casper Worm Hansen). American Economic Journal: Applied Economics, 2023, vol. 15 (1), pp. 164-91. Media: [Bloomberg] [Economist] [Forbes], Video: [Econimate] (permanent working papers: Ager and Hansen (2016, 2017): Media: [The Conversation] [Bloomberg])

"Killer Incentives: Rivalry, Performance and Risk-Taking among German Fighter Pilots, 1939-45", (joint with Leonardo Bursztyn, Lukas Leucht, and Joachim Voth). Review of Economic Studies, 2022, vol. 89 (5), pp. 2257-92. Media: [Voxeu] [NBER Digest] [The Times] [Weekendavisen (in Danish)]

"The Intergenerational Effects of a Large Wealth Shock: White Southerners After the Civil War​", [Online Appendix] [CEPR dp] [NBER wp] (joint with Leah Boustan and Katherine Eriksson). American Economic Review, 2021, vol. 111 (11), pp. 3767-94Media: [Bloomberg] [Citylab] [Economist] [ProMarket] [Voxeu] [Wall Street Journal] [Washington Post] 

"Structural Change and the Fertility Transition", [CEPR dp] [Online Appendix] (joint with Benedikt Herz and Markus Brueckner). Review of Economics and Statistics, 2020, 102 (4), pp. 806-822. Media: [Voxeu] [The Barcelona GSE Voice]

"How the 1906 San Francisco Earthquake Shaped Economic Activity in the American West", [CEPR dp] [NBER wp] [Online Appendix] (joint with Katherine Eriksson, Casper Worm Hansen, and Lars Lønstrup). Explorations in Economic History, 2020, vol. 77 (July), pp. 101342. Media: [Los Angeles Times] [Voxeu]

"Agricultural Risk and the Spread of Religious Communities", [Online Appendix] (joint with Antonio Ciccone). Journal of the European Economic Association, 2018, 16 (4), pp.1021-68. Media: [Nada es gratis] [EHES Blog]


"Fertility and early-life mortality: Evidence from smallpox vaccination in Sweden", [Online Appendix] [Poster] (joint with Casper Worm Hansen and Peter Sandholt Jensen). Journal of the European Economic Association, 2018, 16 (2), pp. 487-521. Media: [EHES Blog]


"Immigrants' Genes: Genetic Diversity and Economic Development in the US", [Online Appendix] (joint with Markus Brueckner). Economic Inquiry, 2018, vol. 56 (April), pp. 1149-64


"The Boll Weevil Plague and its Effect on the Southern Agricultural Sector, 1889-1929", (joint with Markus Brueckner and Benedikt Herz). Explorations in Economic History, 2017, vol. 65 (July), pp. 94-105 


"Cultural Diversity and Economic Growth: Evidence from the US During the Age of Mass Migration", [Online Appendix(joint with Markus Brueckner). European Economic Review, 2013, vol. 64 (November), pp. 76-97


Working Papers

"Gender-biased technological change: Milking machines and the exodus of women from farming", [CEPR dp] [CRC dp] [IZA dp] (joint with Marc Goni and Kjell G. Salvanes) Media: [SWR1 (in German)] [Press Release (in German)]

"Medical Technology and Life Expectancy: Evidence from the Antitoxin Treatment of Diphtheria", [CEPR dp] (joint with Casper Worm Hansen and Peter Z. Lin)

"Froebel's Gifts: How the Kindergarten Movement Changed the American Family", [CEPR dp] (joint with Francesco Cinnirella)

​​"Church Membership and Social Insurance: Evidence from the Great Mississippi Flood of 1927", (joint with Casper Worm Hansen and Lars Lønstrup)


"Bank Entry Regulation and Financial Development: The US Free Banking Experience", (joint with Fabrizio Spargoli) 


"The Persistence of de Facto Power: Elites and Economic Development in the US South, 1840-1960"


Work in Progress

"The Making of an American: Public Kindergartens and the Assimilation of Immigrant Children", (joint with Francesco Cinnirella, Katherine Eriksson, and Viktor Malein)

"The long-term effects of charity nurseries: Evidence from early 20th century New York", (joint with Viktor Malein)

"Liberation Technology? The Impact of the Sewing Machine on Women in the United States", (joint with Davide Coluccia)

"When London Burned to Sticks: The Economic Impact of the Great Fire of 1666", (joint with Maja U. Pedersen, Paul Sharp, and Xanthi Tsoukli)

Other Publications

"The accuracy and efficiency of the Consensus Forecast: A further application and extension of the pooled approach", (joint with Marcus Kappler and Steffen Osterloh). International Journal of Forecasting, 2009, vol. 25 (1), pp. 167-181


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