The signing of a peace agreement between the United States and Iran on Wednesday drove oil prices sharply lower, with Brent crude slipping back below US$77 a barrel. The pullback marks a reversal of the supply fears that had pushed energy costs higher since the conflict erupted, directly feeding into the global inflationary pulse and keeping interest rates elevated across major economies.

For months, the war-driven oil spike compounded existing price pressures, forcing the US Federal Reserve to maintain its benchmark rate at a 19-year high and pushing yields on 30-year Treasury bonds to 5 per cent. Those borrowing costs rippled outward, tightening financial conditions worldwide. Governments that had already amassed record debt loads during successive crises found their interest bills climbing fast. The International Monetary Fund estimates that global public debt now sits near 94 per cent of GDP, led by the United States with liabilities approaching US$39 trillion, followed by China at US$18.7 trillion and Japan, where gross debt exceeds 200 per cent of national output.

The squeeze has broadened beyond public balance sheets. A Wall Street Journal survey reveals that over 40 per cent of upper- and upper-middle-class Americans say they have not saved enough for retirement, while 86 per cent doubt their children will enjoy a better life. Fully 78 per cent of respondents report that high gasoline prices have strained household budgets. Those economic anxieties have translated into a sharp drop in presidential approval ratings, with a PBS/NPR/Marist poll showing 60 per cent of adults disapproving of President Trump’s economic stewardship — the worst mark recorded by that pollster since 2019.

The tension between still-elevated inflation and slowing growth is especially visible in large emerging economies. In Brazil, even after a small cut in the Selic rate to 14.25 per cent, futures markets price the benchmark DI rate near 15 per cent for longer maturities. Domestic fiscal risks and a global investor flight to dollar-denominated assets have kept real yields on inflation-linked government bonds above 8 per cent — a level that attracts savers but signals deep concern about the public debt trajectory.

The oil price decline offers a potential circuit-breaker. If sustained, cheaper energy could help bring headline inflation closer to central bank targets, reducing the urgency for further monetary tightening. The immediate test arrives with the next round of US consumer price data, which policymakers in Washington and beyond will scan for evidence that the peace dividend is already reaching petrol pumps.