US 10-year near 5%: Higher US risk-free rates push duration risk into long-dated African hard-currency bonds

US 10-year yields moved toward and briefly through the 5% area in mid-September, extending a global bond selloff that lifts the global discount rate. The immediate change is higher benchmark yields that re-price present values across hard-currency sovereign and corporate bonds. That mechanically increases required returns and funding costs for external borrowers that price off US Treasuries. Transmission into African credit is through duration and the discount-rate channel: long-dated Eurobonds and external corporate paper carry the largest price sensitivity. Ghana and Zambia's longer maturities (the long end of their Eurobond curves) and South Africa's long dated sovereign curve are most exposed to higher US yields because a higher US curve raises the Treasury discount rate applied to cash flows and steepens the global curve premium demanded by investors.

Higher US yields also widen emerging-market spread premia, lifting refinancing premia on upcoming external amortisations and increasing the cost of tap and new-issue execution for higher-beta credits. The move contrasts across the region: higher global yields widen spreads more on frontier and high-beta credits (Ghana, Zambia) than on better-insulated borrowers with deeper local-currency markets (South Africa's domestically funded issuance). Credit with active IMF or programme support will see the least immediate spread decomposition, while names relying on external rollover and absent IMF cushions will show larger spread moves. The desk watches primary market pull-through and any repricing in new-issue concession levels as the conditional next indicator: if concessionary new-issue premia rise materially, secondary spreads for longer-dated, lower-rated African paper will likely widen further.