Arbeitsmärkte

Die Abteilung Arbeitsmärkte untersucht zentrale Fragen des Arbeitsmarkts, insbesondere Beschäftigung, Arbeitsproduktivität, Lohnbildung und Ungleichheit. Ein wichtiger Bestandteil unserer Forschung ist der Einfluss von Bildungsentscheidungen auf diese Arbeitsmarktergebnisse. Darüber hinaus analysieren wir Prozesse des strukturellen Wandels, die etwa durch die Dekarbonisierung der Wirtschaft, Veränderungen der weltweiten Handelsströme oder technologische Neuerungen ausgelöst werden. Struktureller Wandel beeinflusst die Allokation ökonomischer Ressourcen und prägt damit maßgeblich die langfristige Entwicklung einer Volkswirtschaft. Er führt zum Aufschwung und Niedergang von Regionen, Wirtschaftszweigen und Betrieben und hat direkte Auswirkungen auf den Arbeitsmarkt sowie auf die Lebensumstände einzelner Beschäftigter. Die Abteilung untersucht die Effekte von Bildungsentscheidungen und strukturellem Wandel empirisch mithilfe mikroökonometrischer Methoden.

In diesem Zusammenhang betreibt die Abteilung Arbeitsmärkte die IWH-Insolvenzforschung. Dabei erstellt sie einen viel beachteten ökonomischen Indikator – den IWH-Insolvenztrend – und analysiert dabei die Folgen von Unternehmensschließungen, Massenentlassungen und Insolvenzen auf individuelle Erwerbsverläufe. Die Abteilung erforscht gemeinsam mit dem Gewinner des Max-Planck-Humboldt-Forschungspreises von 2019, Professor Ufuk Akcigit (Chicago), die Ursachen der ökonomischen Unterschiede zwischen Ost- und Westdeutschland.

Diese wissenschaftlich und wirtschaftspolitisch relevanten Forschungsfragen werden durch die Abteilung im Forschungscluster Wirtschaftliche Dynamik und Stabilität sowie im Forschungscluster Produktivität und Institutionen analysiert. 

Das IWH organisiert regelmäßig mit dem Institut für Arbeitsmarkt- und Berufsforschung (IAB) den IWH/IAB-Workshop. Die nächste Veranstaltung am 5./6. Oktober 2026 widmet sich dem Thema: „Transformationsdruck am Arbeitsmarkt: Heterogenität, Anpassungsprozesse und Lehren für die Wirtschaftspolitik“. 
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Professor Dr. Steffen Müller
Professor Dr. Steffen Müller
- Abteilung Arbeitsmärkte
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Referierte Publikationen

Ausgewählte Publikationen

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Industry Mix, Local Labor Markets, and the Incidence of Trade Shocks

Steffen Müller Jens Stegmaier Moises Yi

in: Journal of Labor Economics, Vol. 42 (3), 2024

Abstract

We analyze how skill transferability and the local industry mix affect the adjustment costs of workers hit by a trade shock. Using German administrative data and novel measures of economic distance we construct an index of labor market absorptiveness that captures the degree to which workers from a particular industry are able to reallocate into other jobs. Among manufacturing workers, we find that the earnings loss associated with increased import exposure is much higher for those who live in the least absorptive regions. We conclude that the local industry composition plays an important role in the adjustment processes of workers.

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Can Mentoring Alleviate Family Disadvantage in Adolescence? A Field Experiment to Improve Labor-Market Prospects

Sven Resnjanskij Jens Ruhose Simon Wiederhold Ludger Woessmann Katharina Wedel

in: Journal of Political Economy, Vol. 132 (3), 2024

Abstract

We study a mentoring program that aims to improve the labor-market prospects of school-attending adolescents from disadvantaged families by offering them a university-student mentor. Our RCT investigates program effectiveness on three outcome dimensions that are highly predictive of later labor-market success: math grades, patience/social skills, and labor-market orientation. For low-SES adolescents, the mentoring increases a combined index of the outcomes by over half a standard deviation after one year, with significant increases in each dimension. Part of the treatment effect is mediated by establishing mentors as attachment figures who provide guidance for the future. Effects on grades and labor-market orientation, but not on patience/social skills, persist three years after program start. By that time, the mentoring also improves early realizations of school-to-work transitions for low-SES adolescents. The mentoring is not effective for higher-SES adolescents. The results show that substituting lacking family support by other adults can help disadvantaged children at adolescent age.

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European Firm Concentration and Aggregate Productivity

Tommaso Bighelli Filippo di Mauro Marc Melitz Matthias Mertens

in: Journal of the European Economic Association, Vol. 21 (2), 2023

Abstract

This paper derives a European Herfindahl–Hirschman concentration index from 15 micro-aggregated country datasets. In the last decade, European concentration rose due to a reallocation of economic activity toward large and concentrated industries. Over the same period, productivity gains from an increasing allocative efficiency of the European market accounted for 50% of European productivity growth while markups stayed constant. Using country-industry variation, we show that changes in concentration are positively associated with changes in productivity and allocative efficiency. This holds across most sectors and countries and supports the notion that rising concentration in Europe reflects a more efficient market environment rather than weak competition and rising market power.

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Immigration and Entrepreneurship in the United States

Pierre Azoulay Benjamin Jones J. Daniel Kim Javier Miranda

in: American Economic Review: Insights, Vol. 4 (1), 2022

Abstract

Immigration can expand labor supply and create greater competition for native-born workers. But immigrants may also start new firms, expanding labor demand. This paper uses U.S. administrative data and other data resources to study the role of immigrants in entrepreneurship. We ask how often immigrants start companies, how many jobs these firms create, and how these firms compare with those founded by U.S.-born individuals. A simple model provides a measurement framework for addressing the dual roles of immigrants as founders and workers. The findings suggest that immigrants act more as "job creators" than "job takers" and that non-U.S. born founders play outsized roles in U.S. high-growth entrepreneurship

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The Place-based Effects of Police Stations on Crime: Evidence from Station Closures

Sebastian Blesse André Diegmann

in: Journal of Public Economics, Vol. 207 (March), 2022

Abstract

Many countries consolidate their police forces by closing down local police stations. Police stations represent an important and visible aspect of the organization of police forces. We provide novel evidence on the effect of centralizing police offices through the closure of local police stations on crime outcomes. Combining matching with a difference-in-differences specification, we find an increase in reported car theft and burglary in residential properties. Our results are consistent with a negative shift in perceived detection risks and are driven by heterogeneous station characteristics. We can rule out alternative explanations such as incapacitation, crime displacement, and changes in police employment or strategies at the regional level. We argue that criminals are less deterred due to a lower visibility of the local police.

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Arbeitspapiere

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Socioeconomic Inequality in Life Expectancy: Perception and Policy Demand in the United States and Germany

Lasse J. Jessen Sebastian Koehne Patrick Nüß Jens Ruhose

in: IWH Discussion Papers, Nr. 12, 2026

Abstract

Using survey experiments in the United States and Germany with about 12,000 participants, we study perceptions of socioeconomic inequality in life expectancy and policy demand. Respondents overestimate the rich-poor gap in both countries, judging the life expectancy of the rich roughly accurately but placing that of the poor well below its true level. These misperceptions vary little with political orientation or other characteristics. Correcting them shifts concern but leaves policy demand largely unchanged across general, specific, and real-stakes measures. Instead, demand divides politically, sharply in the United States and much less in Germany, consistent with views about the role of government rather than the inequality itself shaping policy demand.

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Off the Labor Supply Curve: The Zero Employer Size Wage Effect Within Large Firms

André Diegmann Steffen Müller Benjamin Schoefer

in: IWH Discussion Papers, Nr. 8, 2026

Abstract

We revisit the employer size wage effect (ESWE) – arguably the most basic and influential departure from the law of one price for labor. Our main result is that this canonical fact disappears completely across establishments within the same firm, even though they operate in different local labor markets. We uncover and dissect this fact by including a firm fixed effect in otherwise standard cross-sectional regressions of wages on establishment size. We implement this demanding specification in population-wide triple-linked firm-establishment-employee data in Germany. This result is new in the ESWE literature (for which our paper also provides the first systematic meta-analysis). This wage-size decoupling is hard to square with the view that employment is determined along a finitely elastic employerspecific labor supply curve – i.e., employers pay exactly the minimum needed for the quantity of labor, but no more – the foundation of the monopsony view. By contrast, large multi-establishment firms (MEF) appear to hire off their labor supply curves (or those curves are very elastic), pay wage premia above the monopsonistic minimum, and leave excess labor supply. We find some evidence for a reemergence of the ESWE within low-premium MEFs. Overall, at least for the 25% of German employment in large firms for which the ESWE disappears, wage setting and employment determination may be better accounted for by alternative models, namely accommodating above-market-clearing wage premia and rationing of labor supply, such as efficiency wage theories.

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Patents, Firm Rents, and Worker Compensation: Causal Evidence from Quasi-random Patent Allocation

Afroza Alam André Diegmann

in: IWH Discussion Papers, Nr. 6, 2026

Abstract

This paper provides new causal evidence on how patent allowances affect firms and their employees based on quasi-random assignment of patent applications to examiners. Exploiting employer-employee records with newly linked German firm data and web-scraped patent documents, we show that patent-induced shocks reduce firm exit, improve productivity, and increase wages, with rent-sharing elasticities between 0.10 and 0.21. Wage gains are broadly observed across occupational tasks, with high heterogeneity: managers benefit disproportionately in publicly traded firms, whereas broader wage increases accrue to workers in non-traded firms. Our findings highlight the role of institutional features and firm organization in shaping how rents are shared.

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The Geography of Worker-Firm Sorting: Drivers of Rising Colocation

Nils Torben Hollandt Steffen Müller

in: IWH Discussion Papers, Nr. 22, 2025

Abstract

Spatial segregation of low- and high-wage workers is a persistent economic issue with broad social implications. Using social security data and an AKM wage decomposition, this paper examines spatial wage inequality in West Germany. Spatial inequality in log wages rose sharply between 1998 and 2008, mainly due to increased variance in worker pay premiums across regions (48%) and stronger positive spatial assortative matching of workers and establishments (40%), i.e. colocation. Changes in establishment wage premia are mostly unrelated to rising colocation whereas labor mobility even reduced it. Instead, growth in worker pay premiums among stayers was concentrated in regions where high-wage workers and high-wage establishments were overrepresented already in the 1990s and, thus, magnified pre-existing colocation leading to ‘colocation without relocation’. Germany’s rising trade surplus, especially with Eastern Europe, boosted stayers’ worker pay premiums in those ex-ante high-wage regions and fully explains rising colocation.

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Management Opposition, Strikes and Union Threat

Patrick Nüß

in: IWH Discussion Papers, Nr. 17, 2025

Abstract

I estimate management opposition to unions in terms of hiring discrimination in the German labor market. By sending 13,000 fictitious job applications, revealing union membership in the CV and pro-union sentiment via social media accounts, I provide evidence for hiring discrimination against union supporters. Callback rates are on average 15% lower for union members. Discrimination is strongest in the presence of a high sectoral share of union members and large firm size. I further explore variation in regional and sectoral strike intensity over time and find suggestive evidence that discrimination increases if a sector is exposed to an intense strike. Discrimination is positively associated with the sectoral share of firms that voluntarily orientate wages to collective agreements. These results indicate that hiring discrimination can be explained by union threat effects.

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