It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.
-- Mark Twain
Do high levels of public debt reduce economic growth? This is an important policy question. A positive answer would imply that, even if effective in the short-run, expansionary fiscal policies that increase the debt-to-GDP ratio may reduce long-run growth, and thus partly (or fully) negate the positive effects of the fiscal stimulus.
Most policymakers do seem to think that debt reduces growth. This view is in line with the results of a growing empirical literature which shows that there is a negative correlation between public debt and economic growth, and finds that this correlation becomes particularly strong when public debt approaches 100% of GDP (Reinhart and Rogoff 2010a, 2010b; Kumar and Woo 2010; Cecchetti et al. 2011).
Debt and Growth - What Causes What?
