Research

Publications in Refereed Journals 

• Bjelac, J., Chernozhukov, V., Klotz, P. A., Kueck, J., & Schmitz, T. (2026). Automatic debiased machine learning and sensitivity analysis for sample selection models. Proceedings of Machine Learning Research, PMLR 323:353-392, 2026.

• Gail, M. M., & Klotz, P. A. (2025). E-book Pricing Under the Agency Model: Lessons from the UK. Journal of Industry, Competition and Trade, 25(1), 17.
  doi.org/10.1007/s10842-025-00451-y 

• Götz, G., Herold, D., Klotz, P. A., & Schäfer, J. T. (2025). The substitutability between brick-and-mortar stores and e-Commerce: the case of books. Journal of Cultural Economics, 49(4), 811-854.
  doi.org/10.1007/s10824-025-09544-2 

• Herold, D., Klotz, P. A., & Schäfer, J. T. (2025). Munich goes viral: Measuring the impact of the Oktoberfest on COVID-19 infection rates using difference-in-differences. Health Policy, 157, 105332.
  doi.org/10.1016/j.healthpol.2025.105332 

• Drolsbach, C. P., Gail, M. M., & Klotz, P. A. (2023). Pass-through of temporary fuel tax reductions: Evidence from Europe. Energy Policy, 183, 113833. doi.org/10.1016/j.enpol.2023.113833 

• Götz, G., Herold, D., Klotz, P.A. & Schäfer, J. T. (2021). Efficiency in COVID-19 Vaccination Campaigns – A Comparison across Germany’s Federal States. Vaccines 2021, 9(7), 788.
  doi.org/10.3390/vaccines9070788 

Other Publications

• Gail, M., Götz, G., Herold, D., Klotz, P. A., Lüke, D., Paha, J., & Schäfer, J. (2023). Staatliche Eingriffe in die Preisbildung: Darstellung, Erklärung und Wirkungsanalyse. Springer Fachmedien Wiesbaden GmbH. doi.org/10.1007/978-3-658-40674-5 

Working Papers

• The impact of infrastructure duplication on investment in network industries, with Gordon Klein and Johannes Paha, Bremen Papers on Economics & Innovation, No. 2601 (2026).

• Representativeness over time in two probability-based self-administered panel surveys in Germany, with Julian Diefenbacher, Barbara Felderer, Jannis Kueck and Martin Spindler (2026). R&R at Journal of Survey Statistics and Methodology. 

• Derailing the Car? The Effect of Germany’s Deutschlandticket on Road Traffic, with Theresa Daniel and Maximilian Gail, available at SSRN 5138487 (2025). R&R at Transport Policy. 

• Digital vs. Physical Goods: Evidence from the Book Market, with Maximilian Gail, available at SSRN 4899241 (2024). 

• Health Communication and COVID-19 Vaccination Hesitancy: A Synthetic Control Approach, available at SSRN 4209277 (2024). 

• Innovation, Bestsellers and Digitization - Where to Find the Needle in the Haystack?, with Georg Götz, Daniel Herold and Jan Thomas Schäfer, MAGKS Joint Discussion Paper Series in Economics, No. 12-2020.

Work in progress

• Panel Attrition in a Self-Administered Survey: A Double Machine Learning Approach, with Julian Diefenbacher, Barbara Felderer, Jannis Kueck, Aline Mohr and Martin Spindler.

• Price Rigidity in Fuel Markets: Evaluating Germany’s Noon Pricing Rule, with Theresa Daniel and Jan Thomas Schäfer. 

• Charging Ahead: The Impact of Funding Programs on the Charging Infrastructure in Germany, with Melissa Bantle and Johannes Paha.

Presentations at Conferences

• EStALI Spring Forum, 2025, Brussels, Belgium: Charging Ahead: The Impact of Funding Programs on the Charging Infrastructure in Germany. 

• DICE Brown Bag Seminar, 2024, Düsseldorf, Germany: The Impact of Public Transport Subsidies on Highway Traffic: Evidence from Germany. 

• CISS, 2024, Ulcinj, Montenegro: Charging Ahead: The Impact of Funding Programs on the Charging Infrastructure in Germany. 

• VfS, 2024, Berlin, Germany: The Impact of Public Transport Subsidies on Highway Traffic: Evidence from Germany. 

• EEA, 2024, Rotterdam, Netherlands: The Impact of Public Transport Subsidies on Highway Traffic: Evidence from Germany. 

• VfS, 2023, Regensburg, Germany: Pass-through of Temporary Fuel Tax Reductions: Evidence from Europe.

• CRESSE, 2023, Rhodes, Greece: Pass-through of Temporary Fuel Tax Reductions: Evidence from Europe.

• VfS, 2022, Basel, Switzerland: Health Communication and COVID-19 Vaccination Hesitancy: A Synthetic Control Approach.

• EARIE, 2022, Vienna, Austria: Digital vs. Physical Goods: Evidence from the Book Market.

• Stata Conference on Applied Econometrics, 2022, Marseille, France: Health Communication and COVID-19 Vaccination Hesitancy: A Synthetic Control Approach.

• International Conference on Risk Analysis, 2022, Perugia, Italy: Health Communication and COVID-19 Vaccination Hesitancy: A Synthetic Control Approach.

• MaCCI, 2022, Mannheim, Germany: Digital vs. Physical Goods: Evidence from the Book Market.

• RGS Doctoral Conference, 2022, Dortmund, Germany: Digital vs. Physical Goods: Evidence from the Book Market.

• Brown Bag Seminar University of Münster, 2021, Germany: Efficiency in COVID-19 Vaccination Campaigns – A Comparison across Germany’s Federal States.

• MaCCI, 2021, Mannheim, Germany: The Impact of the Agency Model on e-book Prices: Evidence from the UK.

• RGS Doctoral Conference, 2021, Dortmund, Germany: The Impact of the Agency Model on e-book Prices: Evidence from the UK.

• EARIE, 2019, Barcelona, Spain: The Substitutability between Brick-and-Mortar Stores and e-Commerce.