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Studies

Scientific Publications of the Cologne Institute for Economic Research: IW-Trends, IW policy papers, IW-Analysen, IW-Studien, IW-Reports, IW-Kurzberichte and Expertises. Read more about our Approach to Research.

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Fiscal Effects of Having Children
IW-Report No. 43 15. October 2026

Fiscal Effects of Having Children

Wido Geis-Thöne

The fiscal effects of children are relevant to various areas of policymaking.

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Universal entitlement, unequal provision: childcare in segregated German cities
External Publication 13. October 2026

Universal entitlement, unequal provision: childcare in segregated German cities

Matthias Diermeier / Jan Engler* / Melinda Fremerey / Leon Wansleben* in Journal of Social Policy

One mechanism driving persistent inequalities in childcare provision, despite rising investments and a substantial expansion of childcare facilities, may consist in the locational choices of providers, who eschew poorer neighbourhoods.

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A Comparison of Public Revenues Across the Federal States
IW-Report No. 41 12. October 2026

A Comparison of Public Revenues Across the Federal States

Björn Kauder

To ensure equivalent living conditions, the federal government influences the revenues of the states and municipalities. Under the fiscal equalization system, financially weak states receive surpluses in the distribution of sales tax revenues, while financially strong states must accept shortfalls.

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German Foreign Investment and the debate over Germany as a business location
IW-Report No. 39 6. October 2026

German Foreign Investment and the debate over Germany as a business location

Samina Sultan / Jürgen Matthes

Geopolitical pressure and the debate over Germany’s competitiveness make it necessary to develop a more precise understanding of German foreign direct investment. This report provides a comprehensive empirical analysis and also examines the implications for Germany as a business location.

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The Honesty-Attitude-Behavior Gap: A Cross-Country Comparison
IW-Trends No. 3 29. September 2026

The Honesty-Attitude-Behavior Gap: A Cross-Country Comparison

Dominik Enste / Jennifer Potthoff / Augustin Renz

Honesty reduces transaction costs and is therefore a prerequisite for effective economic cooperation.

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Complementary Capabilities for Circular Practices: Firm-Level Evidence in Germany on the Role of Digitalization and Innovation
External Publication 16. September 2026

Complementary Capabilities for Circular Practices: Firm-Level Evidence in Germany on the Role of Digitalization and Innovation

Sarah Lichtenthäler / Adriana Neligan in Journal of Circular Economy

The transition to a circular economy (CE) requires firms to reconfigure business models, processes and capabilities.

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Making Apprenticeships a Success: From Marketing to Hiring
IW-Report No. 38 11. September 2026

Making Apprenticeships a Success: From Marketing to Hiring

Paula Risius / Dirk Werner / Philip Herzer / Fritz Orange / Regina Flake / Franziska Arndt / Yasin Küçükyavuz / Edgar Schmitz

In-company vocational training is a key factor in securing skilled labour. The first step in investing in future employees is to approach and recruit new apprentices. For many companies, filling the apprenticeship positions they offer is a challenge.

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Transatlantic Subnational Innovation Competitiveness Index 3.0
Expertise 11. September 2026

Transatlantic Subnational Innovation Competitiveness Index 3.0

Axel Plünnecke et al

Innovation and competitiveness drive productivity, economic growth, and welfare growth.

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GTIPA Perspectives: Making AI Policy to Drive Innovation
External Publication 9. September 2026

GTIPA Perspectives: Making AI Policy to Drive Innovation

Vera Demary

Germany’s federal structure leads to a diverse landscape of AI policies across the country. While the EU AI Act establishes a general framework for AI policy throughout the continent, Germany’s federal government is responsible for national AI policies.

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AI skills demand in the EU
Expertise 8. September 2026

AI skills demand in the EU

Jan Büchel / Jan Engler / Armin Mertens

More and more companies in Europe are using artificial intelligence (AI) technologies. In 2025, one in five companies in the EU with 10 employees or more used at least one major AI technology, up from 8% in 2023 (Eurostat, 2026a).

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