12.08.2025 • 24/2025
20 years after Hurricane Katrina: Church membership contributed significantly to economic recovery
Katrina and other hurricanes caused devastating damage in the south-east of the USA in the summer of 2005. A study by the Halle Institute for Economic Research (IWH) shows: in the years following the disaster, establishments in counties with higher rates of church membership saw a significantly stronger recovery in terms of productivity.
Felix Noth
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Carbon Transition Risk and Corporate Loan Securitization
Isabella Müller, Huyen Nguyen, Trang Nguyen
Journal of Financial Intermediation,
Vol. 63 (July),
2025
Abstract
We examine how banks manage carbon transition risk by selling loans given to polluting borrowers to less regulated shadow banks in securitization markets. Exploiting the election of Donald Trump as an exogenous shock that reduces carbon risk, we find that banks’ securitization decisions are sensitive to borrowers’ carbon footprints. Banks are more likely to securitize brown loans when carbon risk is high but swiftly change to keep these loans on their balance sheets when carbon risk is reduced after Trump’s election. Importantly, securitization enables banks to offer lower interest rates to polluting borrowers but does not affect the supply of green loans. Our findings are more pronounced among domestic banks and banks that do not display green lending preferences. We discuss how securitization can weaken the effectiveness of bank climate policies through reducing banks’ incentives to price carbon risk.
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12.06.2025 • 19/2025
Economic recovery in Germany – but structural problems and US trade policy weigh on the economy
The German economy has picked up somewhat in the first half of 2025. This was helped by the temporary increase in demand from the US in anticipation of higher tariffs. If the US does not escalate its trade conflicts further, production in Germany according to the summer forecast of the Halle Institute for Economic Research (IWH) is likely to increase a bit (by 0.4%) in 2025, after two years of decline. In March, the IWH economists were forecasting growth of 0.1% for the current year. Growth of 1.1% is forecast for the year 2026. Similar expansion rates are to be expected for East Germany.
Oliver Holtemöller
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Assumption Errors and Forecast Accuracy: A Partial Linear Instrumental Variable and Double Machine Learning Approach
Katja Heinisch, Fabio Scaramella, Christoph Schult
IWH Discussion Papers,
No. 6,
2025
Abstract
Accurate macroeconomic forecasts are essential for effective policy decisions, yet their precision depends on the accuracy of the underlying assumptions. This paper examines the extent to which assumption errors affect forecast accuracy, introducing the average squared assumption error (ASAE) as a valid instrument to address endogeneity. Using double/debiased machine learning (DML) techniques and partial linear instrumental variable (PLIV) models, we analyze GDP growth forecasts for Germany, conditioning on key exogenous variables such as oil price, exchange rate, and world trade. We find that traditional ordinary least squares (OLS) techniques systematically underestimate the influence of assumption errors, particularly with respect to world trade, while DML effectively mitigates endogeneity, reduces multicollinearity, and captures nonlinearities in the data. However, the effect of oil price assumption errors on GDP forecast errors remains ambiguous. These results underscore the importance of advanced econometric tools to improve the evaluation of macroeconomic forecasts.
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14.05.2025 • 16/2025
Private ownership boosts hospital performance
New research by the Halle Institute for Economic Research (IWH) and ESMT Berlin shows that private equity (PE) acquisitions lead to substantial operational efficiency gains in hospitals, challenging common public concerns. The study reveals that hospitals acquired by PE firms significantly reduce costs and administrative staff without increasing closure rates or harming patient care.
Merih Sevilir
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Cross-Subsidization of Bad Credit in a Lending Crisis
Nikolaos Artavanis, Brian Lee, Stavros Panageas, Margarita Tsoutsoura
Review of Financial Studies,
Vol. 38 (5),
2025
Abstract
We study the corporate-loan pricing decisions of a major, systemic bank during the Greek financial crisis. A unique aspect of our data set is that we observe both the actual interest rate and the “break-even rate” (BE rate) of each loan, as computed by the bank’s own loan-pricing department (in effect, the loan’s marginal cost). We document that low-BE-rate (safer) borrowers are charged significant markups, whereas high-BE-rate (riskier) borrowers are charged smaller and even negative markups. We rationalize this de facto cross-subsidization through the lens of a dynamic model featuring depressed collateral values, impaired capital-market access, and limit pricing.
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Media Response
Media Response April 2026 Oliver Holtemöller: IWH-Vize kritisiert Entlastungspaket: "zum Kopfschütteln" in: Zeit Online, 14.04.2026 Oliver Holtemöller: Spediteur: Entlastungen für…
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10.04.2025 • 14/2025
In East Germany, as in the west, the economy is in crisis - Implications of the Joint Economic Forecast Spring 2025 and new data for the East German economy
In 2024, the economy in East Germany shrank by 0.1% and in Germany as a whole by 0.2%. The Halle Institute for Economic Research (IWH) expects stagnation for East Germany in 2025 and growth of 1.1% in 2026. According to the IWH forecast, the unemployment rate is expected to be 7.8% in both 2025 and 2026, after 7.5% in 2024.
Oliver Holtemöller
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Geopolitischer Umbruch verschärft Krise – Strukturreformen noch dringlicher
Dienstleistungsauftrag des Bundesministeriums für Wirtschaft und Klimaschutz,
No. 1,
2025
Abstract
Die deutsche Wirtschaft befindet sich weiterhin in der Krise. Der Beginn des Jahres 2025 ist geprägt von erheblichen innen- aber auch außenpolitischen Veränderungen. In Deutschland ist die wirtschaftspolitische Unsicherheit angesichts des Regierungswechsels hoch. Gleichzeitig belastet die protektionistische Handelspolitik der USA die deutsche Konjunktur. Zudem hat sich mit der neuen Regierung in den USA die Sicherheitslage in Europa verschlechtert. Vor diesem Hintergrund haben Bundestag und Bundesrat die Finanzverfassung Deutschlands grundlegend geändert und weitreichende öffentliche Verschuldungsspielräume geschaffen.
Die wirtschaftliche Schwäche in Deutschland ist nicht nur konjunktureller, sondern auch struktureller Natur. So sehen sich deutsche Unternehmen einem verstärkten internationalen Wettbewerb vor allem aus China ausgesetzt. Zudem scheint ein Teil der Produktion in der energieintensiven Industrie dauerhaft weggefallen zu sein. Eine schwindende Erwerbsbevölkerung und hoher bürokratischer Aufwand sind weitere strukturelle Schwächen, unter denen die deutsche Wirtschaft leidet.
Das Bruttoinlandsprodukt dürfte in diesem Jahr mit einem Anstieg um 0,1 % kaum mehr als stagnieren. Damit revidieren die Institute die Prognose vom Herbst 2024 recht deutlich um 0,7 Prozentpunkte nach unten. Insbesondere im Sommerhalbjahr 2025 wird inzwischen die Dynamik aufgrund der US-Zollpolitik schwächer eingeschätzt. Damit verzögert sich die erwartete Erholung. Im weiteren Prognosezeitraum dürfte eine voraussichtlich expansive Finanzpolitik die Konjunktur beleben. Im kommenden Jahr dürfte steigt das Bruttoinlandsprodukt um 1,3 %, wobei 0,3 Prozentpunkte der höheren Zahl an Arbeitstagen zu verdanken sind. Damit ist die Rate gegenüber der Herbstprognose unverändert, das Niveau der Wirtschaftsleistung ist aber 0,8 % niedriger.
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Economic Outlook
Joint Economic Forecast Spring 2026 Energy Price Shock Dampens Recovery – Inflation Rises April 1, 2026 Although the leading economic research institutes consider the German…
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