5.34% and a Finance Minister’s Problem

On Thursday the yield on the 10-year US Treasury touched 5.34%, its highest since 2002. The same day, Britain’s 30-year gilt yield crossed 6% for the first time since 1998, and France’s 10-year borrowing cost briefly touched 4.96%, a 25-year high. In February, before the Iran war began, the US 10-year yielded 3.94%.

That 140-basis-point jump is a headache for Western treasuries. For a finance minister in Nairobi, Cairo or Islamabad, it is something worse: it raises the minimum price of their own borrowing. Emerging-market bonds are priced as a premium over Treasuries, so every rise in the US benchmark lifts the bar for refinancing in dollars. The question is no longer whether the era of cheap money is over. It is who cannot afford what replaces it.

How the Floor Moved

The proximate cause is an oil shock. Brent is back above $100, and core inflation in the US, measured by the Fed’s preferred gauge, reached 3.3% in July. On 16 September the Federal Reserve raised rates to 3.75–4.00%, its first increase in more than three years, and markets expect more. The Bank of Japan has lifted its rate to 1.25%, the highest since 1995. Average government borrowing costs across the G7 are at their highest since 2008, as Western governments borrow heavily for, among other things, a multi-trillion-dollar defence build-up. The dollar index has pushed back above 100.

The developing world entered this squeeze already stretched. In 2024 developing countries paid a record $415 billion in interest on their external debt, and between 2022 and 2024 they paid out $741 billion more to creditors than they received in new financing — the widest gap in 50 years.

Not 1982 — Something Slower and Wider

The reflexive comparison is with 1982, when Paul Volcker’s rate hikes tipped Latin America into a lost decade, or the 2013 “taper tantrum”. It is the wrong comparison for the big emerging economies, and that is precisely why the danger is being underestimated.

Large emerging markets are far better protected than in past cycles. Many hiked early and hard after 2021: Brazil’s policy rate is still 13.75%, giving investors a large cushion over inflation. Much of their government debt is now in their own currencies, and reserves are deep. In the week the Fed hiked, the investment-grade slice of emerging-market dollar debt actually rose slightly, and Mexican sovereign bonds gained.

The stress is gathering at the bottom of the ladder. In that same week, CCC-rated sovereign bonds — the lowest grade before default — fell for a second straight week. By late September, investors were shunning the riskiest emerging-market bonds as US yields soared.

Here is the trap. This spring, when spreads (the premium over Treasuries) briefly fell back to prewar levels, frontier governments rushed to borrow. In April alone, sovereign dollar issuance hit $29.8 billion, more than double a year earlier. Pakistan returned to the market after four years away and the Democratic Republic of Congo made a $1.3 billion debut; in May, Bolivia sold dollar bonds for the first time since 2022. The IMF noted that frontier repayments are concentrated towards the end of 2026. Those countries raised money on the assumption that the window would stay open. It has since closed.

What makes 2026 different from earlier rate cycles is that the rate shock has arrived together with an oil shock and a stronger dollar. For oil-importing borrowers, these three pressures compound. Egypt shows how. In the first three weeks of the war, foreign investors pulled roughly $7 billion from its treasury-bill market and the pound slid from 47.7 to 52.6 per dollar. On 14 September, as markets braced for the Fed, foreigners sold another $419 million of Egyptian bills in a single session. In Egypt and Uzbekistan, fuel subsidies absorb roughly 28% of government spending, according to Boston University’s Global Development Policy Center, which lists a dozen countries — including Egypt, Kenya, Ghana, Jordan and El Salvador — facing both rising borrowing costs and above-median debt payments this year. Pakistan’s reserves of about $21.4 billion are almost entirely deposits and loans from Saudi Arabia, China and bondholders, and roughly equal to its $21.5 billion of debt service due this fiscal year.

None of these countries needs a crash to get into trouble. They only need the window to stay shut for 12 to 18 months while their bills come due. If several hit the wall at once, the machinery for handling defaults is painfully slow. Zambia’s restructuring under the G20’s Common Framework took four years; Ethiopia, which applied in 2021, is still in limbo. Bridging Western and Chinese creditors, as Modern Diplomacy has noted, remains the unsolved problem of the development finance system.

The strongest objection is that this is a war premium that will reverse: a ceasefire would bring oil down, inflation would ease and yields would fall back. Some of it would. But the forces that kept long-term rates low in the 2010s are fading for reasons that have nothing to do with Iran. Western governments are borrowing more, inflation has sat above target for five years, and Japan — for decades the world’s great exporter of cheap savings — is raising rates. A ceasefire might take 50 basis points off the 10-year yield. It will not bring back the world of 2% Treasuries that let frontier economies borrow dollars at single-digit yields.

Three Paths for the Next Six Months

Base case (around 55%) — a grinding squeeze, not a crash. The US 10-year holds between 5% and 5.5%. Large emerging markets weather it. Frontier bond markets stay largely closed, and governments lean on the IMF, Gulf and Chinese deposits and their own banks. One or two of the weakest, CCC-rated borrowers miss a payment or seek a debt exchange. The damage shows up mainly as austerity, subsidy cuts and slower growth. This rests on oil staying near $100 rather than spiking again.

Downside case (around 25%) — a dollar spike exposes the oil importers. A renewed oil surge from the Gulf or the Red Sea forces the Fed into further hikes and drives the dollar sharply higher. Egypt is pushed into another large devaluation, and three or more frontier sovereigns fail to refinance maturities falling due in late 2026 and 2027. With several cases arriving at once, the Common Framework clogs, and IMF resources are stretched across simultaneous programmes — the scenario markets are least prepared for.

Upside case (around 20%) — the window reopens. A durable US-Iran settlement brings Brent towards $80, inflation fades and the Fed pauses. Yields slip below 5% and a refinancing window opens in early 2027. If governments at the IMF and World Bank meetings also agree a faster way to roll over maturing debt for solvent but illiquid borrowers, the frontier tier survives this cycle — though on far costlier terms than it borrowed on.

The Bill Arrives at the Bottom

The end of cheap money will not hit the Global South evenly. The big emerging economies spent the past five years building defences, and they will hold. The real exposure lies with oil-importing frontier borrowers that returned to the bond market this spring on terms that no longer exist, and that now face higher dollar rates, a stronger dollar and costlier fuel all at once.

Watch the IMF and World Bank Annual Meetings in Bangkok from 12 to 18 October. If shareholders agree a concrete liquidity backstop for countries facing near-term maturities, the base case holds. If they produce only communiqués, expect the first frontier missed payment of this cycle before mid-2027.

Cheap money was a tide that lifted the weakest boats last. Now it is going out, and they will be the first to touch bottom.