The paper offers an approach to assessing the sustainability of public debt taking into account the effect of fiscal policy on output, as well as uncertainty in the model parameters and system dynamics. Uncertainty is specified in general terms, and the analysis is based on the notion of invariant sets. Examples are provided to illustrate how the method can be applied in practice.

This paper examines the sustainability of fiscal policy under uncertainty in three emerging market countries, Brazil, Mexico, and Turkey. For each country, we estimate a vector autoregression (VAR) that includes fiscal and macroeconomic variables. Retrospectively, a historical decomposition shows by how much debt accumulation reflects unsustainable policy, adverse shocks, or both. Prospectively, Monte Carlo techniques reveal the primary surplus that is required to keep the debt/GDP ratio from rising in all but the worst 50 percent, 25 percent, and 10 percent of circumstances. Such a value-at-risk approach presents a clearer menu of policy options than currently used frameworks.

Despite its beneficial aspects, public debt can be hazardous for macroeconomic performance should it reach unrepayable levels as a consequence of snowballing explosive trends. Failure to monitor the existing trend in public debt in order to detect such divergences from the stable path, and the lack of an adaptive public financial management can potentially culminate in a public debt crisis whose disruptive economic impacts can permeate all sectors of the economy very swiftly. However, public debt sustainability is a vague concept with no straightforward operational definitions. In addition, its multi-faceted nature is an impediment for the implementation of real-world appraisal of the fiscal posture from a stability viewpoint. As such, quantifying the public debt sustainability is essential for overhauling the fiscal policies so as to avoid a potential debt crisis stemming from malfunctioning fiscal policies. This book provides the reader with a practical and straightforward framework that outlines a tool for undertaking public debt sustainability analysis. In order to guide further empirical investigations, the discussion in this book is underpinned by a real-world application of the model which highlights the practical aspects of the tool with reference to time-varying empirical evidence from a developing country.

This paper proposes a new framework for the analysis of public sector debt sustainability. The framework uses concepts and methods from modern practice of contingent claims to develop a quantitative risk-based model of sovereign credit risk. The motivation in developing this framework is to provide a clear and workable complement to traditional debt sustainability analysis which-although it has many useful applications-suffers from the inability to measure risk exposures, default probabilities and credit spreads. Importantly, this new framework can be adapted for policy analysis, including debt and reserve management.

Addressing the Global Financial Crisis required fiscal intervention on a substantial scale by governments around the world. The consequent build up of public debt, in particular its sustainability, have moved centre stage in the policy debate. If the Asia Pacific region is to continue to serve as an engine for global growth its public debt must be sustainable. The book addresses this issue for Asia Pacific as a whole as well as for three of the most dynamic economies in the region: China, India and Vietnam. The book begins with a discussion of the reasons why there is increased attention on debt related issues and outline the contents of the volume. The book also includes fiscal indicators for Developing Member Countries (DMCs) as categorized by the Asian Development Bank (ADB). Debt sustainability for these countries is assessed through extant approaches and with the most updated data sources. It also surveys the extant literature on debt sustainability, outlining the main issues related to debt sustainability and discusses the key implications for the application of debt sustainability analysis in developing Asia. The book highlights the importance of doing individual country studies in view of wide variations in definitions of public expenditure, revenues, contingent liabilities, government structures (e.g. federal), and the like as well as in the impact of debt on interest rates. It provides in-depth debt sustainability analyses of China, India and Vietnam. The book is a comprehensive analytical and empirical update of the sustainability public debt in developing Asia. It breakes new ground in that various characteristics of the sustainability that have not yet been explored in the literature which, nevertheless, are crucial to understanding it. As a consequence, the policy analysis is based on firmer footings than in the extant literature and should prove useful to graduate students, researchers as well as policymakers.

As countries recover from the coronavirus pandemic, they are confronted with an even more challenging debt crisis. Xavier Debrun argues in the foreword that in deciding where we go from here that there is no longer a consensus regarding the optimum design and enforcement of fiscal rules. Rather we must address a series of questions and challenges to the conventional wisdom. This book provides an opportunity for scholars to explore these questions from an international perspective, with reference to European countries, and emerging nations as well as the United States.

This paper critically reviews recent work regarding the sustainability of public debt. It argues that Debt Sustainability Analyses (DSAs) should be more than mere mechanical simulation exercises. Instead, a DSA should be linked to some objective regarding the distribution of fiscal burdens and distortions over time (in the tradition of Barro’s 1979 tax smoothing objective). The paper discusses objective functions that yield simple and transparent fiscal policy rules.

Public debt has become a severe problem for a great many economies. While the effects of tax policies on the allocation of resources are readily derived, the mechanisms that make public deficits and debt influence the economy are not so easily understood. This book elaborates on the effects of public debt starting from the intertemporal budget constraint of the government. It is shown under which conditions a government can stick to the intertemporal budget constraint and then, demonstrated how public debt affects the growth process and welfare in market economies. The effects are derived for models with complete labor markets as well as taking into account labor market imperfections. The focus in this book is on fiscal policy issues, but it also deals with monetary policy aspects. The theoretical analysis is complemented with empirical time series analyses on debt sustainability and with panel studies dealing with the relationship between public debt and economic growth.

This paper develops a methodology for estimating a safe public debt level that would allow countries to remain below a maximum sustainable debt limit, taking into account the impact of uncertainty. Our analysis implies that fiscal policy should target a debt level well below the debt ceiling to allow space to absorb shocks that are likely to hit the economy. To illustrate our findings we apply the methodology to estimate a safe debt level for South Africa. Our results suggest that South Africa’s debt ceiling is around 60 percent of GDP, although uncertainty is high. Simulations suggest targeting a debt-to-GDP ratio of 40 percent of GDP would allow South Africa to remain below this debt ceiling over the medium-term with a high degree of confidence.

This paper assesses the cyclicality and sustainability of fiscal policy in Belize and applies a stochastic simulation model to determine the optimal set of fiscal rules. The empirical analysis shows that fiscal policy in Belize has been significantly procyclical and unsustainable much of the period since 1976. While the government’s recent commitment to maintain a primary surplus of at least 2 percent of GDP until 2021 is supporting debt reduction, stochastic simulations indicate that further improvement in the primary balance is necessary to reliably bring the debt-to-GDP ratio to a sustainable path. Given Belize’s history of large economic shocks, this paper proposes explicit fiscal rules designed for countercyclical policy and debt sustainability. It recommends integrating such rules into a well-designed fiscal responsibility law and establishing an independent fiscal council to improve accountability and transparency.