Public debt dynamics: the effects of austerity, inflation, and growth shocks

摘要

We study the impact of macroeconomic shocks on US public debt dynamics using a VAR with debt feedback. Following a primary balance, or austerity, shock, the debt ratio initially declines but at a cost of lower growth. The debt ratio then rises to its pre-shock path, suggesting the austerity shock could be self-defeating. An inflation shock reduces the debt ratio initially, while a positive growth shock unambiguously lowers debt. Our specification, properly incorporating the debt equation, produces different debt impulse responses and forecasts from VAR models either excluding debt or including debt linearly.