Abstract
I consider the sustainability of public debt by using an overlapping generations model with human capital accumulation (private and public education) and public debt. By admitting that the government can finance public educational expenditure by issuing new public debt, based on this model, I explicitly show (i) the parameter region in which public debt is not sustainable for any initial endowment and (ii) the threshold of initial endowment over (under) which the economy diverges from (converges to) the steady state. I also show that the threshold is neutral to the level of human capital. Further, I analytically show the existence and uniqueness of the long-run growth-maximizing level of each policy variable (i.e., the tax rate and public education/production ratio) when public debt is sustainable.
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