The research intends to improve the existing knowledge on the debt-growth nexus by analyzing the link between different countries, in our case between Morocco, Egypt and Ecuador. Scholars have debated the influence of external debt on economic growth since the debt crisis that began in the 1980s. This book investigates how external debt impacts the economic growth of selected deeply indebted countries via the debt overhang and debt crowding out effect. This is accomplished by analyzing data from three deeply indebted countries around the world from 1970 to 2023. The estimation results suggest that external debt influences economic development through debt overhang. Furthermore, to highlight debt servicing effect. The book discovered that the selected countries do not pay (serve) more than 95% of their total debt. We used a deductive approach based on a thorough literature review that incorporated both theoretical and empirical data. We then conducted an economic analysis using the ARDL model to assess the impact of public debt (domestic and foreign) on Morocco's, Egypt's and Ecuador's economic growth.