The course ends not with crisis but with the routine, skilled function that prevents it: debt management. A government with a debt-management office that thinks carefully about cost and risk, manages its maturity and currency structure, and is transparent about what it owes is far less likely to end up in the distress of the previous modules. This module covers that function — the unglamorous discipline that, done well, keeps a country out of trouble.
The debt manager's objective
Lowest cost, prudent risk
The standard objective of a debt-management office (DMO): to meet the government's financing needs at the lowest possible cost over the medium-to-long term, subject to a prudent degree of risk. The two halves are in tension — the cheapest financing is usually the riskiest (short-term, foreign-currency, floating-rate debt is cheap but exposes the country to rollover, currency, and interest-rate shocks, as the instruments module showed), and the safest is usually more expensive (long-term, local-currency, fixed-rate debt costs more in term and currency premia). Debt management is the disciplined navigation of this cost-risk trade-off — not minimising cost (which invites crisis) nor minimising risk (which wastes money), but choosing the structure that balances them given the country's tolerance and circumstances. It is portfolio management for the sovereign's liabilities.
The medium-term debt strategy
The DMO operationalises this through a medium-term debt strategy (MTDS) — a plan, typically covering 3–5 years, for the composition of new borrowing across the key dimensions: currency (domestic vs foreign), maturity (short vs long), interest rate (fixed vs floating), and source (concessional vs commercial vs domestic). The MTDS analyses the cost and risk of alternative borrowing strategies under different scenarios (interest-rate paths, exchange-rate shocks) and chooses the strategy that best balances expected cost against the risk of the debt-service burden spiking under stress. The IMF and World Bank provide a standard MTDS framework that many countries use. A published MTDS is a sign of a serious, transparent debt management — and its absence a warning sign.
The risk types
- Rollover / refinancing risk — the risk that maturing debt cannot be refinanced, or only at much higher cost; driven by the maturity structure (the Eurobond refinancing wall). Managed by lengthening and smoothing maturities.
- Currency risk — the risk that a depreciation balloons the cost of foreign-currency debt (the valuation effect); managed by limiting foreign-currency exposure (reducing original sin).
- Interest-rate risk — the risk that rising rates raise debt-service costs; driven by the share of floating-rate and short-term (soon-to-be-refinanced) debt; managed by fixing rates and lengthening maturities.
- Contingent-liability and fiscal risk — the risk from SOEs, guarantees, and PPPs (the Budgeting course) that can land on the debt; managed by monitoring, disclosing, and limiting them.
Debt transparency
The hidden-debt problem
A debt you don't disclose is a debt you can't manage — and one that can destroy credibility when it surfaces. Debt transparency (full, accurate disclosure of what the government and its entities owe) is increasingly recognised as foundational, for several reasons: you cannot manage or restructure debt whose terms and size you don't know (the Chinese-loan and restructuring problems of earlier modules); hidden debts spring fiscal surprises that trigger crises (the contingent-liability problem of the Budgeting course); and opacity raises borrowing costs (investors price in the uncertainty). The cautionary tale is Mozambique's 'hidden debt' / tuna-bond scandal (2016): the government had secretly guaranteed over $1 billion of borrowing by state-owned companies, undisclosed to parliament, the IMF, or markets; when it surfaced, donors suspended support, the currency collapsed, and the country fell into crisis and a difficult restructuring — all triggered by debt that had been concealed. The episode crystallised the global push for debt transparency (disclosure standards, registries, collateral disclosure) as a precondition for sound debt management and a stable system. What is not disclosed cannot be managed, and eventually detonates.
The function that prevents the crises
Pulling the course together: good debt management is the routine practice that prevents the distress the middle modules describe. A DMO that borrows for productive purposes (module 1), watches the sustainability arithmetic (module 2), structures the debt to limit currency and rollover risk (module 3), uses cheap concessional finance before expensive commercial (modules 4–5), manages the maturity profile to avoid a refinancing wall, monitors contingent liabilities, and discloses everything transparently is doing the unglamorous work that keeps a country solvent. Most sovereign-debt crises are failures of this function — over-borrowing for consumption, ignoring the r−g arithmetic, building up short-term foreign-currency debt, hiding liabilities — as much as they are bad luck. The final lesson of the course is therefore a constructive one: sovereign-debt distress is largely preventable, by the disciplined, transparent, risk-aware management of the sovereign balance sheet that this module describes.
Exercise
A debt-management office is setting its strategy. It can borrow cheaply short-term in dollars (3%), more expensively long-term in dollars (6%), or most expensively long-term in local currency (12%). The country has a history of currency depreciation and a maturity profile bunched in the next three years. (1) Explain the cost-risk trade-off across the three options. (2) Recommend a strategy and justify it against the country's specific vulnerabilities. (3) Explain how an MTDS would formalise this choice and what risks it would stress-test. (4) Separately, an SOE wants the government to quietly guarantee its borrowing — advise, citing the hidden-debt lesson.