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Sovereign and Emerging Market Debt

One-line definition

Government bonds issued outside the developed-market Treasury/Gilt/Bund universe this repo's curve and credit machinery already assumes — split into hard-currency debt (issued in USD/EUR, credit risk without direct FX exposure) and local-currency debt (issued in the sovereign's own currency, currency risk layered on top of credit risk).

Vocabulary

  • Hard-currency (external) debt: denominated in a major reserve currency (usually USD), settled internationally. The investor takes sovereign credit/default risk but not direct currency risk — the same CDS and basis and credit curves machinery already built for corporate credit applies, with the issuer being a government instead of a company.
  • Local-currency debt: denominated and often settled in the sovereign's own currency, requiring local custody. Adds currency depreciation and inflation risk on top of credit risk — this is where FX carry and FX spot/forward become directly relevant to a sovereign-debt position, not just a separate FX overlay.
  • EMBI / GBI-EM: the standard benchmark index families (J.P. Morgan) for hard-currency and local-currency EM sovereign debt respectively — the practitioner's reference point the same way a Treasury or aggregate-bond index is for developed-market fixed income.

Why PMs care

The hard-currency-vs-local-currency choice is a genuinely different risk decision, not just a labeling detail: a hard-currency sovereign bond PM is making a credit call (will this government default or restructure?) largely insulated from that currency's day-to-day moves, while a local-currency PM is making a combined credit-and-currency call, with currency risk often the larger swing factor. A PM choosing between the two isn't choosing "safer vs. riskier" in one dimension — they're choosing which risk (credit vs. currency) they want to underwrite, and in which combination.

Why this isn't implemented in src/pm

Sovereign credit analysis (assessing a government's fiscal position, debt sustainability, external reserves, and political risk) is a different discipline from corporate fundamental credit analysis (leverage/coverage ratios don't apply the same way to a country), and this repo doesn't have sovereign fiscal/reserves data to build a tested model against. The mechanical pieces that do apply directly — CDS/basis pricing for hard-currency credit risk, FX carry/forward pricing for local-currency risk — are already implemented and reused here rather than duplicated.

Common mistakes

  • assuming hard-currency debt is "safe" because it removes FX risk — a government can still default or restructure hard-currency debt (many historical EM defaults were on USD-denominated bonds specifically)
  • assuming local-currency debt's higher historical volatility means it's strictly worse risk-adjusted — its low correlation to other fixed income (via the FX component) is a real diversification benefit that a volatility number alone doesn't capture
  • treating "emerging markets" as one homogeneous risk bucket — a 1.5% yielding EM sovereign and a 13-14% yielding EM sovereign in the same local-currency index are pricing in very different fiscal and currency outlooks

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