The Joint Dynamics of Sovereign Ratings and Government Bond Yields
Makram El-Shagi, Gregor von Schweinitz
Abstract
In the present paper, we build a bivariate semiparametric dynamic panel model to repro-duce the joint dynamics of sovereign ratings and government bond yields. While the individual equations resemble Pesaran-type cointegration models, we allow for different long-run relationships in both equations, nonlinearities in the level effect of ratings, and asymmetric effects in changes of ratings and yields. We find that the interest rate equation and the rating equation imply significantly different long-run relationships. While the high persistence in both interest rates and ratings might lead to the misconception that they follow a unit root process, the joint analysis reveals that they converge slowly to a joint equilibrium. While this indicates that there is no vicious cycle driving countries into default, the persistence of ratings is high enough that a rating shock can have substantial costs. Generally, the interest rate adjusts rather quickly to the risk premium that is in line with the rating. For most ratings, this risk premium is only marginal. However, it becomes substantial when ratings are downgraded to highly speculative (a rating of B) or lower. Rating shocks that drive the rating below this threshold can increase the interest rate sharply, and for a long time. Yet, simulation studies based on our estimations show that it is highly improbable that rating agencies can be made responsible for the most dramatic spikes in interest rates.
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The Effects of Fiscal Policy in an Estimated DSGE Model – The Case of the German Stimulus Packages During the Great Recession
Andrej Drygalla, Oliver Holtemöller, Konstantin Kiesel
Abstract
In this paper, we analyse the effects of the stimulus packages adopted by the German government during the Great Recession. We employ a standard medium-scale dynamic stochastic general equilibrium (DSGE) model extended by non-optimising households and a detailed fiscal sector. In particular, the dynamics of spending and revenue variables are modeled as feedback rules with respect to the cyclical component of output. Based on the estimated rules, fiscal shocks are identified. According to the results, fiscal policy, in particular public consumption, investment, transfers and changes in labour tax rates including social security contributions prevented a sharper and prolonged decline of German output at the beginning of the Great Recession, suggesting a timely response of fiscal policy. The overall effects, however, are small when compared to other domestic and international shocks that contributed to the economic downturn. Our overall findings are not sensitive to the allowance of fiscal foresight.
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28.05.2018 • 13/2018
Einladung zum Workshop „Europäische Wirtschaft stärken – Forschungsergebnisse aus dem Leibniz-Forschungsverbund ‚Krisen einer globalisierten Welt‘“
Im Rahmen des Leibniz-Forschungsverbunds „Krisen einer globalisierten Welt“ organisiert das Leibniz-Institut für Wirtschaftsforschung Halle (IWH) gemeinsam mit dem ZEW, Zentrum für europäische Wirtschaftsforschung sowie dem Bundesministerium für Wirtschaft und Energie (BMWi) einen Workshop, der sich den Fragen zur Zukunft des internationalen Handels und der europäischen Integration widmet.
Oliver Holtemöller
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02.05.2018 • 10/2018
IWH Policy Talk „Think global – Internationalisierung als Hochschulpolitik.“ Karamba Diaby, MdB, zu Gast am IWH
Das Leibniz-Institut für Wirtschaftsforschung Halle (IWH) lädt am Dienstag, dem 8. Mai 2018, um 17:00 Uhr zu einem IWH Policy Talk zum Thema „Think global – Internationalisierung als Hochschulpolitik“ mit Karamba Diaby, Mitglied des Deutschen Bundestags, in den Konferenzsaal des Instituts ein.
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