Forecasting Economic Activity Using a Neural Network in Uncertain Times: Monte Carlo Evidence and Application to the
German GDP
Oliver Holtemöller, Boris Kozyrev
IWH Discussion Papers,
No. 6,
2024
Abstract
In this study, we analyzed the forecasting and nowcasting performance of a generalized regression neural network (GRNN). We provide evidence from Monte Carlo simulations for the relative forecast performance of GRNN depending on the data-generating process. We show that GRNN outperforms an autoregressive benchmark model in many practically relevant cases. Then, we applied GRNN to forecast quarterly German GDP growth by extending univariate GRNN to multivariate and mixed-frequency settings. We could distinguish between “normal” times and situations where the time-series behavior is very different from “normal” times such as during the COVID-19 recession and recovery. GRNN was superior in terms of root mean forecast errors compared to an autoregressive model and to more sophisticated approaches such as dynamic factor models if applied appropriately.
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Is Risk the Fuel of the Business Cycle? Financial Frictions and Oil Market Disturbances
Christoph Schult
IWH Discussion Papers,
No. 4,
2024
Abstract
I estimate a dynamic stochastic general equilibrium (DSGE) model for the United States that incorporates oil market shocks and risk shocks working through credit market frictions. The findings of this analysis indicate that risk shocks play a crucial role during the Great Recession and the Dot-Com bubble but not during other economic downturns. Credit market frictions do not amplify persistent oil market shocks. This result holds as long as entry and exit rates of entrepreneurs are independent of the business cycle.
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A Congestion Theory of Unemployment Fluctuations
Yusuf Mercan, Benjamin Schoefer, Petr Sedláček
American Economic Journal: Macroeconomics,
No. 1,
2024
Abstract
We propose a theory of unemployment fluctuations in which newhires and incumbentworkers are imperfect substitutes. Hence, attempts to hire away the unemployed during recessions diminish the marginal product of new hires, discouraging job creation. This single feature achieves a ten-fold increase in the volatility of hiring in an otherwise standard search model, produces a realistic Beveridge curve despite countercyclical separations, and explains 30–40% of U.S. unemployment fluctuations. Additionally, it explains the excess procyclicality of new hires’ wages, the cyclical labor wedge, countercyclical earnings losses from job displacement, and the limited steady-state effects of unemployment insurance.
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IWH-Flash-Indikator IV. Quartal 2023 und I. Quartal 2024
Katja Heinisch, Oliver Holtemöller, Axel Lindner, Birgit Schultz
IWH Flash Indicator,
No. 4,
2023
Abstract
Im dritten Quartal 2023 sank die Wirtschaftsleistung in Deutschland leicht um 0,1%, das schwache Plus aus dem Vorquartal wurde damit wieder abgeschmolzen. Insbesondere nahmen die Konsumausgaben der privaten Haushalte weiter ab. Das dürfte nicht zuletzt der immer noch recht kräftigen Inflation bei nur moderat steigenden Haushaltsbudgets geschuldet sein. Auch ist die Verunsicherung der privaten Haushalte nach wie vor groß, etwa bezüglich der Finanzierbarkeit der künftig notwendigen Klimaschutzmaßnahmen oder bezüglich der mittelfristigen Wirtschaftsaussichten in Deutschland.
Zudem haben sich die geopolitischen Risiken mit dem Ausbruch kriegerischer Handlungen im Nahen Osten noch einmal erhöht. Auch wenn für das vierte Quartal 2023 aufgrund wieder etwas steigender Realeinkommen ein kleiner Zuwachs der Produktion in Deutschland zu erwarten ist, lässt der Aufschwung auf sich warten. Das Bruttoinlandsprodukt (BIP) dürfte laut IWH-Flash-Indikator im vierten Quartal 2023 sowie im ersten Quartal 2024 jeweils um 0,2% steigen (vgl. Abbildung 1).
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Corporate Bankruptcies in Germany
Steffen Müller
Wirtschaftsdienst,
No. 11,
2023
Abstract
Corporate bankruptcy in Germany has been on a long-run decline. Even before the recent double crisis of the pandemic and multiple cost shocks, bankruptcy figures were one-third lower than around the turn of the century but were larger and affected more mature firms. With the onset of the double crisis, bankruptcies plummeted further while the number of affected jobs rose initially. Government rescue programmes hindered the exit of many small unproductive firms. Since mid-2023, bankruptcies of registered firms are higher than before the pandemic. Due to the current recession and the need to repay government support, the number of bankruptcies will rise until the end of 2023 and likely beyond.
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Understanding Post-Covid Inflation Dynamics
Martín Harding, Jesper Lindé, Mathias Trabandt
Journal of Monetary Economics,
November
2023
Abstract
We propose a macroeconomic model with a nonlinear Phillips curve that has a flat slope when inflationary pressures are subdued and steepens when inflationary pressures are elevated. The nonlinear Phillips curve in our model arises due to a quasi-kinked demand schedule for goods produced by firms. Our model can jointly account for the modest decline in inflation during the Great Recession and the surge in inflation during the post-COVID period. Because our model implies a stronger transmission of shocks when inflation is high, it generates conditional heteroskedasticity in inflation and inflation risk. Hence, our model can generate more sizeable inflation surges due to cost-push and demand shocks than a standard linearized model. Finally, our model implies that the central bank faces a more severe trade-off between inflation and output stabilization when inflation is elevated.
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22.06.2023 • 16/2023
Revival in service sectors, but industrial activity remains weak for the time being
After the recession during winter, the German economy will expand at a moderate pace in the coming quarters and despite higher interest rates, as private consumption will pick up again with slowly declining inflation and increased wage momentum. In its summer forecast, the Halle Institute for Economic Research (IWH) expects gross domestic product to decline by 0.3% in 2023, while growth of 1.7% is forecast for the coming year.
Oliver Holtemöller
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Konjunktur aktuell: Belebung in Dienstleistungsbranchen, aber zunächst weiter schwache Industriekonjunktur
Konjunktur aktuell,
No. 2,
2023
Abstract
Im Sommer 2023 deuten Stimmungsindikatoren auf einen weltweiten Aufschwung in den Dienstleistungsbranchen, die Konjunktur im Verarbeitenden Gewerbe bleibt aber schwach. Hohe Inflation und gestiegene Leitzinsen dämpfen die Konjunktur in den meisten Weltregionen. In Europa belasten auch im langjährigen Vergleich hohe Energiepreise. Insgesamt bleibt die Dynamik der Weltwirtschaft im Jahr 2023 verhalten. Die deutsche Wirtschaft wird in mäßigem Tempo expandieren, denn mit sinkender Inflation und erhöhter Lohndynamik wird der private Konsum wieder zulegen. Das Bruttoinlandsprodukt dürfte 2023 um 0,3% zurückgehen, für das kommende Jahr ist ein Zuwachs von 1,7% prognostiziert. Für 2023 ist mit einer Inflationsrate von 6,1% und für 2024 mit 2,7% zu rechnen.
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