Public debt sustainability in a globally integrated market

Mark Roberts

No 2016/03, Discussion Papers from University of Nottingham, Centre for Finance, Credit and Macroeconomics (CFCM)

Abstract: Public debt is considered in a multi-country Diamond model, initially, where the deficit is exogenous, giving bifurcation maxima, and, subsequently, where it is determined by a policy trade-off between its deficit financing benefit and its crowding-out cost. In the latter case, two effects arise: first, the Chang (1990) financing externality; and second, negative feedback from the debt to the deficit, initially discovered in the data by Bohn (1998), occurs as an endogenous outcome – and one which is strengthened by the degree of international financial integration. The Chang effect implies countries will over-issue public debt under financial globalization, which will also threaten the sustainability of equilibrium in a nonlinear model. The endogenous Bohn feedback effect, although inherently stabilizing, is not decisively so, causing bifurcations to remain, if policy-makers regard deficits and capital as imperfect substitutes. However, for the perfect substitutes case, it works very powerfully even to eradicate the adjustment dynamics and to deliver higher-valued, corner-point maxima.

Keywords: Public debt; portfolio; bifurcation; global integration; policy; economic growth (search for similar items in EconPapers)
Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:not:notcfc:16/03

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