We study the dynamics of U.S. public debt in a parsimonious VAR. We find that including debt feedback ensures the stationarity of debt while standard VARs excluding debt may imply an explosive debt path. We also find that the response of debt to inflation or interest shocks is not robust and depends on the policy regime. The recent past suggests that a positive shock to inflation increases debt while the same to interest rate decreases it. Positive shocks to growth and primary surplus unambiguously reduce debt.