At what point does national debt slow down economic growth? : Planet Money : NPR
Most economic textbooks will tell you that there can be real dangers in running up a big national debt. A major concern is how the debt you add now could slow down economic growth in the future. Economists have not been able to nail down how much debt a country can safely take on. But they have tried.Back in 2010, two economists took a look at 20 countries over the course of decades, and sometimes centuries, and came back with a number. Their analysis suggested that economic growth slowed significantly once national debt passed 90% of annual GDP... and that is when the fight over debt and grow...
Source: npr.org