NEW YORK (AFP) – Stocks slumped on Friday (Aug 26) after Federal Reserve boss Jerome Powell pledged to act “forcefully” against soaring inflation in a battle that will be painful for American families and businesses.

The Fed has been on an aggressive campaign to raise interest rates – and Powell made it clear at the Jackson Hole gathering of global monetary policymakers that the fight against inflation is not over.

“Restoring price stability will take some time and requires using our tools forcefully to bring demand and supply into better balance,” he told the gathering, held against the backdrop of the majestic Grand Teton mountains.

Modest signs of slowing in the world’s largest economy and easing price pressures had spurred hope in financial markets that the central bank might ease up on its aggressive interest rate hikes, and perhaps even start to reverse course next year.

But Powell doused those hopes, making it clear that Fed policy and the benchmark borrowing rate would have to remain “sufficiently restrictive” to return inflation to its two per cent target.

“While higher interest rates, slower growth, and softer labor market conditions will bring down inflation, they will also bring some pain to households and businesses,” Powell said. “But a failure to restore price stability would mean far greater pain.”

Wall Street stocks tumbled, with all three main indices ending with losses of three per cent or more.

Keith Buchanan at Globalt Investments said, “This wasn’t a shocking speech by any stretch of imagination.” He said the negative reaction was due to “the last possibility of a pivot being kind of shoved off the table”.

The dollar lost ground against the euro, but rose against the yen and pound.

Sentiment had been boosted ahead of Powell’s speech by the latest readings of the US personal consumption expenditures price index, the Fed’s preferred yardstick for inflation, which dipped 0.1 per cent from in July from June, and slowed to 6.3 per cent from 6.8 per cent on an annual basis.

But Powell warned that one month of improvement is not enough to declare victory.