Aye lad, there's the rub.
From the Washington Post:
What’s the real harm of a massive government deficit? Carmen Reinhart, Vincent Reinhart, and Kenneth Rogoff find that high public debt is associated with a significantly lower level of GDP in the long run..
In a new paper for the National Bureau of Economic Research, the researchers examined the historical incidence of high government debt levels in advanced economies since 1800, examining 26 different “debt overhang episodes” when public debt levels were above 90 percent for at least five years....MORE