19.02.2026 • 4/2026
Eine Abschaffung von Minijobs würde die Nettoeinkommen der Betroffenen reduzieren
Aktuell wird diskutiert, Minijobs schrittweise in reguläre sozialversicherungspflichtige Beschäftigungsverhältnisse zu überführen. Nach Berechnungen des Leibniz-Instituts für Wirtschaftsforschung Halle (IWH) würde dies bei etwa vier Millionen betroffenen Minijobbern Zusatzeinnahmen der Sozialversicherungen in Höhe von 4,5 Milliarden Euro im Jahr 2026 zulasten der Nettoeinkommen der Betroffenen bedeuten.
Oliver Holtemöller
Birgit Schultz
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What’s the Melting Pot Worth? Multiculturalism and House Prices
Rachel Cho, Hisham Farag, Christoph Görtz, Danny McGowan, Huyen Nguyen, Max Schröder
IWH Discussion Papers,
No. 11,
2025
Abstract
Is there a multicultural neighborhood price premium? We exploit plausibly exogenous variation in British colonization patterns in Northern Ireland during the early 1600s which created neighborhoods of varying religious composition that persists until today. These religious groups are culturally distinct, but are observationally equivalent ethnically and socioeconomically. A standard deviation increase neighborhood-level multiculturalism raises house prices by 9.6%. Multiculturalism raises property prices by increasing asset liquidity and housing demand as a wider spectrum of society demand houses in these areas. The findings and mechanism contrast sharply with prior evidence showing negative relationships due to homophily, social networks, and identification challenges.
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College Application Choices in a Repeated Deferred Acceptance (DA) Setting: Empirical Evidence from Croatia
Dejan Kovač, Christopher Neilson, Johanna Raith
IWH Discussion Papers,
No. 9,
2025
Abstract
How do beliefs on admission probability influence application choices? In this study, we empirically investigate whether and how admission probability is reflected in application choices in a centralized admission system. We exploit a novel setting of a dynamic deferred acceptance mechanism as employed in Croatia with hourly information updates and simultaneous application choices. This setting allows us to explore within-applicant strategic adjustments as a reaction to changing signals on admission probability. We show in an RDD analysis that applicants react to negative signals on admission probability with an increased propensity to adjust their application choices by 11-23%. Additionally, we show how application strategies evolve over time, while applicants learn about their admission probability. The group most-at-risk to remain unmatched improves their application choices by applying to programs with a higher admission probability towards the application deadline. Yet, we also identify a popular and potentially harmful strategy of applying to safer programs before applying to more risky “reach” programs. About a quarter of applicants have the potential to improve their application choices by resorting their application choices.
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Media Response
Media Response April 2026 IWH: Merz macht in Klima, Trump in Wirtschaft - die EU in Ohnmacht in: Tichys Einblick, 16.04.2026 Steffen Müller: Insolvenzen im Januar gestiegen in:…
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Political Corruption, Dodd–Frank Whistleblowing, and Debt Financing
Qingjie Du, Iftekhar Hasan, Yang Wang, K.C. John Wei
Journal of Corporate Finance,
Vol. 91 (April),
2025
Abstract
We investigate how a state's political corruption affects a resident firm's debt contracting and how a change in anti-corruption regulation alters the relation between corruption and loan contracting. Firms in more corrupt states are associated with significantly higher loan spreads and tighter loan covenants than firms in less corrupt states. Furthermore, the passage of the Dodd–Frank whistleblowing provision amplifies the conhcerns of banks about the detrimental impact of corruption due to the increased exposure of firms to whistleblowing threats. The detrimental impact of corruption is further amplified when a state has a higher level of whistleblowing involvement, when firms are located in more corrupt states or closer to the SEC office, and when the bank's state is less corrupt than the firm's state. In general, we document the externality of corruption in the debt financing of firms and the response of banks to changes in regulation.
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Archive
Media Response Archive 2021 2020 2019 2018 2017 2016 December 2021 IWH: Ausblick auf Wirtschaftsjahr 2022 in Sachsen mit Bezug auf IWH-Prognose zu Ostdeutschland: "Warum Sachsens…
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DPE Courses Archive
DPE Course Programme Archive 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2026 IWH-DPE Foundation Course, CGDE First-year Course Microeconomics II…
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Supply Chain Disruptions and Firm Outcomes
Michael Koetter, Huyen Nguyen, Sochima Uzonwanne
IWH Discussion Papers,
No. 3,
2025
Abstract
This paper examines how firms’ exposure to supply chain disruptions (SCD) affects firm outcomes in the European Union (EU). Exploiting heterogeneous responses to workplace closures imposed by sourcing countries during the pandemic as a shock to SCD, we provide empirical evidence that firms in industries relying more heavily on foreign inputs experience a significant decline in sales compared to other firms. We document that external finance, particularly bank financing, plays a critical role in mitigating the effects of SCD. Furthermore, we highlight the unique importance of bank loans for small and solvent firms. Our findings also indicate that highly diversified firms and those sourcing inputs from less distant partners are less vulnerable to SCD.
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Reassessing EU Comparative Advantage: The Role of Technology
Filippo di Mauro, Marco Matani, Gianmarco Ottaviano
IWH-CompNet Discussion Papers,
No. 2,
2024
Abstract
Based on the sufficient statistics approach developed by Huang and Ottaviano (2024), we show how the state of technology of European industries relative to the rest of the world can be empirically assessed in a way that is simple in terms of computation, parsimonious in terms of data requirements, but still comprehensive in terms of information. The lack of systematic cross-industry correlation between export specialization and technological advantage suggests that standard measures of revealed comparative advantage only imperfectly capture a country’s technological prowess due to the concurrent influences of factor prices, market size, markups, firm selection and market share reallocation.
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Reassessing EU Comparative Advantage: The Role of Technology
Filippo di Mauro, Marco Matani, Gianmarco Ottaviano
IWH Discussion Papers,
No. 26,
2024
Abstract
Based on the sufficient statistics approach developed by Huang and Ottaviano (2024), we show how the state of technology of European industries relative to the rest of the world can be empirically assessed in a way that is simple in terms of computation, parsimonious in terms of data requirements, but still comprehensive in terms of information. The lack of systematic cross-industry correlation between export specialization and technological advantage suggests that standard measures of revealed comparative advantage only imperfectly capture a country’s technological prowess due to the concurrent influences of factor prices, market size, markups, firm selection and market share reallocation.
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