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We examine how the composition of public debt, broken down by currency, maturity, holder profile and marketability, has responded to major debt accumulation and consolidation episodes during 1900-2011. Covering thirteen advanced economies, we focus on debt structure shifts that occurred around the two World Wars and global economic downturns, and the subsequent debt consolidations. Notwithstanding data gaps, we are able to recover some broad common patterns. Episodes of large debt accumulation—essentially, large increases in debt supply— were typically absorbed by increases in short-term, foreign currency-denominated, and banking-system-held debt. However, this pattern did not hold during the debt build-ups starting in the 1980s and 1990s, which were compositionally skewed toward long-term local-currency debt. We attribute this change to higher structural demand for sovereign paper, linked to capital account liberalization in advanced economies, the emergence of a large contractual saving sector, and innovative sovereign debt products. With regard to debt consolidations, we find support for the financial repression-cum-inflation channel for post World War II debt reductions. However, the scope for a repeat of this strategy appears limited unless financial liberalization and globalization were materially rolled back or the current globally agreed monetary policy regime built around price stability abandoned. Neither are significant favorable structural demand shifts, as witnessed in the 1980s and 1990s, likely.

task has become particularly challenging in European advanced economies where expectations of low growth and limits to monetary policy support are shifting the burden of adjustment onto fiscal consolidation. The SDN will investigate the main drivers behind successful past debt reversals, focusing on macroeconomic and financial market conditions, the speed and form of fiscal adjustment, and the institutional policy setting, among other things. Its policy conclusions will depend on the emerging stylized facts but are likely to include considerations on the design and pace of fiscal consolidation, taking into account country-specific as well as regional economic, institutional, and political factors.

The paper aims to identify the optimal size, speed and composition of the medium-term fiscal adjustment in the context of Sudan's limited oil reserves. The permanently sustainable non-oil primary balance approach suggests the need for significant fiscal adjustment over the medium term, requiring a widening of the tax base. Cross-country comparisons highlight VAT and personal income tax (as well as tax administration) as key areas for reform. The paper also suggests the need for complementary expenditure-side measures in the areas of petroleum pricing and anchoring fiscal policy in non-oil indicators.