How do sovereign credit ratings affect equity risk premiums?

Question

AcadiFi · Accepted Answer

Sovereign credit ratings (Moody's, S&P, Fitch) reflect default risk on government debt, but they also serve as a proxy for broader country risk that affects equities. A downgrade typically raises the cost of capital for equities in that country.

Mechanism: Damodaran's approach converts sovereign rating into a Country Default Spread (CDS). Rating tables map AAA=0%, AA=0.5%, A=1.2%, BBB=2.0%, BB=3.0%, B=4.5%, CCC=9%+. Multiply by equity-to-bond volatility ratio (typically 1.3x-2.5x) to get the Country Risk Premium for equity.

Case: Marinoia (hypothetical) is downgraded BBB → BB. Sovereign spread rises from 2.0% to 3.0%. Equity-to-bond vol ratio 1.9x. CRP rises from 3.8% to 5.7% — a 190 bp increase.

Impact on a Marinoian firm's valuation: Delphi Hospitality's WACC:
- Pre-downgrade: 4.2% rf + 1.15β × 5.5% ERP + 3.8% CRP = 14.3%
- Post-downgrade: 4.5% rf (rates also rose) + 1.15 × 5.5% + 5.7% = 16.5%

Impact on DCF: assuming terminal growth 3%, FCF year 1 = $18M growing at 6% for 5 years then 3%:
- Pre-downgrade EV ≈ $192M
- Post-downgrade EV ≈ $148M
A 23% drop in enterprise value from a 220 bp WACC change.

Behavioral adjustment: ratings often lag market pricing. CDS spreads typically move first (1-3 months before downgrade), so smart analysts adjust CRP from CDS rather than wait for ratings.

Exam insight: CFA tests this as 'given the sovereign rating changes, how does required return change?' Be ready to map rating to spread and apply the volatility multiplier.

How do sovereign credit ratings affect equity risk premiums?

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