The study looked at how debt affects the economic growth of developing countries. They found that too much debt can slow down growth, but only up to a certain point. Countries with good policies face this issue when debt is between 15-30% of GDP, while for countries with bad policies, the threshold is lower. However, once debt reaches very high levels, above 70-80% of GDP, its impact on growth becomes less important. This suggests that debt relief may not always lead to better growth rates, depending on a country's level of debt and its policies.