Talking Billions with Bogumil Baranowski

Lupin Rahman, PhD: What Sovereign Debt Reveals About the World, Can You Trust a Government to Pay You Back? Why the Risk-Free Rate Is Not Risk-Free — Inside the Mind of a Sovereign Debt Investor

23 snips
Apr 13, 2026
Lupin Rahman, PhD, a senior macroeconomist and sovereign debt specialist with 25+ years at the IMF, World Bank, and PIMCO. He revisits market lessons from his grandmother in Bangladesh. He contrasts policymaker intent with investor pricing. He maps the sovereign debt landscape, explains duration versus maturity, and questions whether the so‑called risk free rate is truly risk free.
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INSIGHT

Return Of Capital Versus Return On Capital

  • Returns split into return of capital (credit/default risk) and return on capital (price moves from rates/spreads).
  • Modern bond managers trade for price gains; many issuers BB+ and above focus on price dynamics more than default risk.
INSIGHT

Maturity Is Not The Same As Duration

  • Maturity is when principal is repaid; duration is interest-rate sensitivity and is usually much shorter than maturity for long bonds.
  • A 100-year bond often has a far shorter duration, so you don't need to hold to maturity.
INSIGHT

What Ratings Tell You And What They Miss

  • Credit ratings provide benchmarking, regulatory guidance, and deep analyst reports but often lag market moves.
  • Markets price risks faster than agencies update ratings, creating pre-downgrade price deterioration.
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