Yardeni Says Inflation, Fed Back in Play as Iran Crisis Returns

Oil prices have surged following US attacks on Iran and the revocation of a temporary waiver on Iranian oil sanctions. Brent crude, the international benchmark, rose over 3% to approximately $77.50 a barrel, reversing a recent slide, while West Texas Intermediate crude also jumped 4.5% to $73.62 a barrel. These events have reignited fears of inflation and put pressure on the Federal Reserve to consider raising interest rates, with money markets fully pricing in an October Fed hike.

The renewed hostilities, stemming from attacks on three commercial vessels in the Strait of Hormuz, have reversed a period of market complacency. Earlier, a ceasefire and a US-Iran memorandum of understanding had eased investor concerns, leading to a rally in stocks fueled by a strong earnings season and optimism about AI's economic potential. However, President Trump's declaration that the ceasefire is "a waste of time" has introduced significant geopolitical risk back into the market.

Economists and analysts are reacting to the shift. AT Global Markets’ Nick Twidale noted that investors are now forced to refocus on geopolitical tensions rather than AI and tech sentiment. Bloomberg Economics’ Andrew Sacher suggested that the upcoming Federal Reserve meeting minutes would likely emphasize concerns about above-target inflation and officials' desire to maintain flexibility for tightening. Violeta Todorova, senior research analyst at Leverage Shares, highlighted that the recent developments mark the most serious rupture in the agreement yet, shattering market complacency.

The US move involves rescinding authorization for any new transactions involving Iranian oil, with no transactions allowed after 12:01 AM on August 21, 2026. This reimposition of strict oil sanctions, paired with military strikes, aims to pressure Tehran. The importance of the Strait of Hormuz is underscored, as roughly one-fifth of global oil consumption passes through this critical waterway, making any disruption a significant threat to global energy prices, shipping costs, and overall inflation.