Transparency and Forecasting: The Impact of Conditioning Assumptions on Forecast Accuracy
Katja Heinisch, Christoph Schult, Carola Stapper
Applied Economic Letters,
forthcoming
Abstract
This study investigates the impact of inaccurate assumptions on economic forecast precision. We construct a new dataset comprising an unbalanced panel of annual German GDP forecasts from various institutions, taking into account their underlying assumptions. We explicitly control for different forecast horizons to reflect the information available at the time of release. Our analysis reveals that approximately 75% of the variation in squared forecast errors can be attributed to the variation in squared errors of the initial assumptions. This finding emphasizes the importance of accurate assumptions in economic forecasting and suggests that forecasters should transparently disclose their assumptions to enhance the usefulness of their forecasts in shaping effective policy recommendations.
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13.03.2025 • 10/2025
A turning point for the German economy?
The international political environment has fundamentally changed with looming trade wars and a deteriorating security situation in Europe. The leading parties in Germany are setting the stage for debt-financed additional defence tasks with far-reaching changes to the debt brake. This entails major risks for the German economy, but also opportunities. Meanwhile, the economy continues to be in a downturn. According to the spring forecast of the Halle Institute for Economic Research (IWH), gross domestic product (GDP) in 2025 is likely to be roughly the same as in the previous year, and it will not increase significantly until 2026, partly because uncertainty about German economic policy is likely to decrease after the new government is established, meaning that the savings rate of private households will fall again somewhat and the debt-financed additional government spending will gradually have an impact on demand. The IWH economists are forecasting an increase in GDP of 0.1% for 2025. In December, they were still forecasting growth of 0.4% for 2025. The outlook is similar for East Germany, where production is likely to have increased slightly in 2024, unlike in Germany as a whole.
Oliver Holtemöller
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Konjunktur aktuell: Zeitenwende für die deutsche Wirtschaft?
Konjunktur aktuell,
No. 1,
2025
Abstract
Die Ankündigungen und Entscheidungen der neuen US-Regierung um den Russland-Ukraine-Konflikt und die Zollpolitik haben weltweit zu hoher Unsicherheit geführt. Im Euroraum bleibt die Konjunktur schwach. Auch die deutsche Konjunktur ist weiter im Abschwung. Das Bruttoinlandsprodukt dürfte im Jahr 2025 um 0,1% und im Jahr darauf um 1,3% zunehmen.
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12.03.2025 • 9/2025
IWH präsentiert neues Prognose-Dashboard zur deutschen Wirtschaft
Das Leibniz-Institut für Wirtschaftsforschung Halle (IWH) stellt ein umfassendes Daten-Tool bereit, das einen interaktiven Vergleich unterschiedlicher Prognosen für die Wirtschaftsentwicklung in Deutschland erlaubt. Entscheider aus Politik und Wirtschaft sowie Interessierte aus Medien, Wissenschaft und Öffentlichkeit können das IWH Forecasting Dashboard kostenfrei nutzen.
Oliver Holtemöller
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Corporate Loan Spreads and Economic Activity
Anthony Saunders, Alessandro Spina, Sascha Steffen, Daniel Streitz
Review of Financial Studies,
No. 2,
2025
Abstract
We use secondary corporate loan-market prices to construct a novel loan-market-based credit spread. This measure has considerable predictive power for economic activity across macroeconomic outcomes in both the U.S. and Europe and captures unique information not contained in public market credit spreads. Loan-market borrowers are compositionally different and particularly sensitive to supply-side frictions as well as financial frictions that emanate from their own balance sheets. This evidence highlights the joint role of financial intermediary and borrower balance-sheet frictions in understanding macroeconomic developments and enriches our understanding of which type of financial frictions matter for the economy.
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16.01.2025 • 3/2025
Medium-term projection for the German economy and scenarios for achieving the targets of the Climate Protection Law
The potential growth rate of the German economy is declining. According to the medium-term projection of the Halle Institute for Economic Research (IWH), potential output is likely to increase by an annual average of just 0.3% in the medium term (2023-2029). The target of climate neutrality by 2045 is likely to be missed by a wide margin without further emission-reducing measures. It could be achieved by means of higher CO₂ prices at significantly lower macroeconomic costs than by means of non-market-based regulatory measures.
Oliver Holtemöller
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12.12.2024 • 31/2024
Frosty prospects for the German economy
The German economy will continue to stagnate in winter 2024/2025. Industry is suffering from a loss of international competitiveness. For this reason and due to the unclear economic policy outlook, firms and consumers are holding back on spending, although incomes have increased recently. Consumer spending will only increase more strongly once the uncertainty subsides. According to the winter forecast of the Halle Institute for Economic Research (IWH), gross domestic product in Germany is expected to fall by 0.2% in 2024 and to expand by 0.4% in 2025. In September, the IWH forecast had still assumed a zero growth in 2024 and a growth of 1.0% in 2025. In East Germany, gross domestic product will increase by 0.5% both this year and in 2025.
Oliver Holtemöller
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Konjunktur aktuell: Frostige Aussichten für die deutsche Wirtschaft
Konjunktur aktuell,
No. 4,
2024
Abstract
Zur Jahreswende dürfte die weltweite Produktion weiterhin in etwa so schnell wie in der Dekade vor der Pandemie expandieren. Die Konjunktur im Euroraum ist nur verhalten, und die Stagnation der deutschen Wirtschaft setzt sich fort. Die Industrie verliert an internationaler Wettbewerbsfähigkeit. Unternehmen und Verbraucher halten sich aufgrund unklarer wirtschaftspolitischer Aussichten mit ihren Ausgaben zurück. Das Bruttoinlandsprodukt dürfte im Jahr 2024 um 0,2% sinken und im Jahr 2025 um 0,4% expandieren.
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Forecasting Natural Gas Prices in Real Time
Christiane Baumeister, Florian Huber, Thomas K. Lee, Francesco Ravazzolo
NBER Working Paper,
No. 33156,
2024
Abstract
This paper provides a comprehensive analysis of the forecastability of the real price of natural gas in the United States at the monthly frequency considering a universe of models that differ in their complexity and economic content. Our key finding is that considerable reductions in mean-squared prediction error relative to a random walk benchmark can be achieved in real time for forecast horizons of up to two years. A particularly promising model is a six-variable Bayesian vector autoregressive model that includes the fundamental determinants of the supply and demand for natural gas. To capture real-time data constraints of these and other predictor variables, we assemble a rich database of historical vintages from multiple sources. We also compare our model-based forecasts to readily available model-free forecasts provided by experts and futures markets. Given that no single forecasting method dominates all others, we explore the usefulness of pooling forecasts and find that combining forecasts from individual models selected in real time based on their most recent performance delivers the most accurate forecasts.
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26.09.2024 • 27/2024
Services stabilise the East German economy – Implications of the Joint Economic Forecast Autumn 2024 and of Länder data from recent publications of the Statistical Offices
In 2024, the East German economy is expected to grow by 0.2%, while it will decline by 0.1% in Germany as a whole. The Halle Institute for Economic Research (IWH) is forecasting an East German growth rate of 0.7% in 2025, and a rate of 1.2% in 2026. According to the IWH forecast, the unemployment rate in eastern Germany is likely to be 7.5% in 2024 as well as 2025 and 7.2% in 2026.
Oliver Holtemöller
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