Sustainable government debt in a two-good, two-country overlapping generations model

The recent dramatic rise of government deficits in most advanced countries to counter the effects of the global financial crisis arouses renewed interest for one of the perennial topics of fiscal policy: the sustainability of government debt. This paper explores maximum sustainabile debt in a two-good, two-country overlapping generations (OLG) model and analyzes existence and dynamic stability of steady states as well as the transitional dynamics of private capital when government debt remains below the maximum sustainable level. We find that maximum government debt levels for both countries exist and are negatively related. Moreover, if sustainable government debt is unilaterally expanded, private capital is crowded out in both countries while the terms of trade of the debt-expanding country are unaffected if capital income shares are internationally equal. © 2010 Springer-Verlag.