Interest-Growth Differentials and Debt Limits in Advanced Economies /

Do persistently low nominal interest rates mean that governments can safely borrow more? To addresses this question, I extend the model of Ghosh and others [2013] to allow for persistent stochastic changes in nominal interest and growth rates. The key model parameter is the long-run difference betwe...

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Détails bibliographiques
Auteur principal: Barrett, Philip
Format: Revue
Langue:English
Publié: Washington, D.C. : International Monetary Fund, 2018.
Collection:IMF Working Papers; Working Paper ; No. 2018/082
Accès en ligne:Full text available on IMF
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520 3 |a Do persistently low nominal interest rates mean that governments can safely borrow more? To addresses this question, I extend the model of Ghosh and others [2013] to allow for persistent stochastic changes in nominal interest and growth rates. The key model parameter is the long-run difference between nominal interest and growth rates; if negative, maximum sustainable debts (debt limits) are unbounded. I show how both VAR- and spectral-based methods produce negative point estimates of this long-run differential, but cannot reject positive values at standard significance levels. I calibrate the model to the UK using positive but statistically plausible average interest-growth differentials. This produces debt limits which increase by only around 5% GDP as interest rates fall after 2008. In contrast, only a tiny change in the long-run average interest-growth differential - from the 95th to the 97.5th percentile of the distribution - is required to move average debt limits by the same amount. 
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