Empirical examination of public debt sustainability in African economies: A panel data analysis

This study intends to investigate public debt sustainability across 29 Sub-Sahara African (SSA) economies, employing various econometric specifications, for the sampled years 1996–2020. The study employs Bohn's (Are stationarity and cointegration restrictions really necessary for the intertemporal budget constraint? Journal of monetary Economics, 54(7), pp.1837–1847.) framework of sustainability as the baseline model to assess public debt sustainability across the sampled Sub-Sahara African economies. As additional tests of public debt sustainability in order to support the baseline findings, the study also employs panel unit root and timeseries unit tests. The baseline findings from the OLS, panel quantile and instrumental panel quantile regressions show that public debt is sustainable across the panel of SSA economies. The positive and statistically significant response of primary balance under the Bohn's framework of sustainability manifest that the intertemporal budget constraint is not violated in the sampled economies. The consistency in the estimates under the OLS, panel quantile and instrumental panel quantile regressions also show that the estimates are robust throughout the estimation process. Also, utilizing the panel unit root test for public debt sustainability, the findings show that public debt is stationary over the sampled years which implies that intertemporal budget constraint holds and that public debt is sustainable across the sampled SSA economies. However, the timeseries analysis indicate that although majority of the SSA economies have sustainable public debt ratios, four countries namely Uganda, Sudan, Togo and Cote d'Ivoire have unsustainable public debt ratios. The study has important policy implications in terms of prudent public debt management and fiscal management for the sampled SSA economies.