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The Joint Dynamics of Sovereign Ratings and Government Bond Yields

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  • El-Shagi, Makram
  • von Schweinitz, Gregor

Abstract

In the present paper, we build a bivariate semiparametric dynamic panel model to reproduce 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.

Suggested Citation

  • El-Shagi, Makram & von Schweinitz, Gregor, 2015. "The Joint Dynamics of Sovereign Ratings and Government Bond Yields," IWH Discussion Papers 4/2015, Halle Institute for Economic Research (IWH).
  • Handle: RePEc:zbw:iwhdps:iwh-4-15
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    Cited by:

    1. El-Shagi, Makram, 2016. "Much ado about nothing: Sovereign ratings and government bond yields in the OECD," IWH Discussion Papers 22/2016, Halle Institute for Economic Research (IWH).
    2. El-Shagi, Makram & von Schweinitz, Gregor, 2019. "Fiscal policy and fiscal fragility: Empirical evidence from the OECD," IWH Discussion Papers 13/2019, Halle Institute for Economic Research (IWH).
    3. Leo de Haan & Robert Vermeulen, 2018. "The impact of sovereign debt ratings on euro area cross-border holdings of euro area sovereign debt," DNB Working Papers 620, Netherlands Central Bank, Research Department.

    More about this item

    Keywords

    sovereign risk; rating agencies; semiparametric model; nonlinearities;

    JEL classification:

    • C14 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Semiparametric and Nonparametric Methods: General
    • C25 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Discrete Regression and Qualitative Choice Models; Discrete Regressors; Proportions; Probabilities
    • F34 - International Economics - - International Finance - - - International Lending and Debt Problems
    • G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage

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