The article investigates whether differences in public sector management quality affect the link between public debt and economic growth in developing countries. For this purpose, we primarily use the World Bank's institutional indices of public sector management (PSM). Using PSM thresholds, we split our panel into country clusters and make comparisons. Our linear baseline regressions reveal a significant negative relationship between public debt and growth. The various robustness exercises that we perform also confirm these results. When we dissect our data set into "weak" and "strong" county clusters using public sector management scores, however, we find different results. While public debt still displayed a negative relationship with growth in countries with "weak" public sector management quality, it generally displayed a positive relationship in the latter group.The tests for non-linearity shows evidence of an "inverse-U"-shape relationship between public debt and economic growth. However, we fail to see a similar significant relationship on country clusters that account for PSM quality. Yet, countries with wellmanaged public sectors demonstrate a higher public debt sustainability threshold.

The study of the link between debt and growth has been full of debates, both in theory and empirics. However, there is a growing consensus that the relationship is sensitive to the level of debt. Our paper tries to address the question of non linearity in the long term relationship between public debt and economic growth. Specifically, we set out to test if there exists an established "laffer curve" type relationship, where debt contributes to economic growth up to a certain point (maximal threshold) and then starts to have a negative effect on growth afterwards. To carry out our tests, we have used a methodology that delivers a superior test of bell shapes, in addition to the traditional test based on a regression with a quadratic specification. The results show evidence of a bell-shaped relationship between economic growth and total public debt in a panel of low income Sub-Saharan African economies. This supports the hypothesis that debt has some positive contribution to economic growth in lowincome countries, albeit up to a point. If debt goes on increasing beyond the level where it would be sustainable, it may start to be a drag on economic growth.

Currency crises, generally defined as rapid depreciations of a local currency or loss of foreign exchange reserves, are common incidents in modern monetary systems. Due to their repeated occurrence and severity, they have earned wide coverage by both theoretical and empirical literature. However, unlike advanced and emerging economies, currency crises in low-income countries have not received due attention. This paper uses the signals approach developed by Kaminsky et al. (1998) and assesses currency crisis in Ethiopia over the time frame

GrOW Working Paper Series GWP-2018-19 -Research Contribution Paper Produced with support from McGill University and the International Development Research Centre (IDRC). Working papers are in draft form and distributed for purposes of comment and discussion only. The observations and views expressed in this working paper are the sole responsibility of the author(s).