This graph from a FRBSF paper Private Credit and Public Debt in Financial Crises, by Òscar Jordà, Moritz Schularick, and Alan M. Taylor, perfectly illustrates how high public debt levels impede the ability of an economy to recover from a financial crisis:
Figure 3……. shows that high levels of public debt can be a considerable drag on the recovery. The figure displays the path of per capita GDP in a typical recession compared with the paths under three scenarios following a financial crisis resulting from excess growth of private credit. Each of the three scenarios corresponds to a specified level of public debt at the start of the recession. The dotted line represents a low level of debt of about 15% as a ratio to GDP; the solid line represents a medium level of debt of about 50% of GDP, which is the historical average; and the dashed line represents a high level of debt of about 85% of GDP.
Read more at Federal Reserve Bank San Francisco | Private Credit and Public Debt in Financial Crises.
Hat tip to Barry Ritholz