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Motivated to some extent by the empirical significance of student loans in the U.S., this paper incorporates knowledge capital formation by working households financed through debt to a demand-led dynamic model of physical and knowledge capital utilization and output growth. Average labor productivity varies positively with the average knowledge capital across the labor force. A rise in labor productivity resulting from knowledge capital accumulation is fully passed on to the real wage so that the wage share remains constant. In the unique long-run equilibrium, which is stable, an exogenous rise in the wage share raises the rates of physical capital utilization and output growth but has an ambiguous effect on the rate of employment (which also measures the rate of knowledge capital utilization). The long-run equilibrium also features the following interrelated results: the output growth rate is greater than the exogenous interest rate; the debt ratio (working households' debt as a ratio of either the physical or the knowledge capital, or the output) is independent of the interest rate; and the allocation of a higher (lower) proportion of wage income to debt repayment (consumption) raises instead of lowers the debt ratio, which we dub the paradox of debt repayment. [ABSTRACT FROM AUTHOR]

This paper aims to analyze the sustainability of student debt in the US. For this purpose, I build a neo-Kaleckian model in which households can borrow to either consume or invest in human capital. Next, I calibrate the model using US data to simulate the economic effects of specific policies such as student loan forgiveness. To my knowledge, this is the first study that considers household borrowing for two different purposes, consumption and human capital accumulation, in a demand-led macro-modeling framework. The main findings are that (i) household debt is sustainable in the long run (i.e., the debt servicing is compatible with the long-term economic growth) for a consumption level greater than 90% of household income; (ii) new borrowing boosts short-term economic activity while having ambiguous long-term effects because of its outcomes to household indebtedness and debt servicing; and (iii) student loan cancelation has only short-run economic effects, whereas reducing loan interest rates and changing the eligibility criterion for student loan forgiveness result in long-term effects. [ABSTRACT FROM AUTHOR]