LONDON—The dollar shot higher on Monday, briefly scaling fresh 20-year highs against a basket of other currencies, as Federal Reserve Chair Jerome Powell signaled interest rates would be kept higher for longer to bring down uncomfortably high inflation.
The dollar index, which measures the currency's value against a basket of peers, scaled a fresh two-decade peak of 109.48 before pulling back slightly as the European session wore on.
It held around 0.5 percent firmer against Japan's yen, while China's yuan breached the key threshold of 6.9 per dollar and Britain's pound hit a fresh 2–1/2 year low.
The euro managed to claw back some ground and was last up 0.3 percent at $0.9993 as hawkish European Central Bank comments lifted expectations for a supersized September rate hike.
London markets were closed for a public holiday.
Powell told the Jackson Hole central banking conference in Wyoming on Friday that the Fed would raise rates as high as needed to restrict growth, and would keep them there "for some time" to bring down inflation that is running at more than three times the Fed's 2 percent goal.
"Powell's comments endorsed the pricing of a higher Fed funds rate for a longer period," said Kenneth Broux, a currency strategist at Societe Generale. "The assumption that the Fed would start cutting rates in mid-2023 is premature."
Money markets ramped up bets for a more aggressive Fed rate hike in September, with the chances of a 75 basis point hike now seen around 70 percent. U.S. Treasury yields shot up, with two-year bond yields hitting a 15-year high at around 3.49 percent, bolstering the greenback.
The dollar was up 0.54 percent at 138.43 yen, having hit its highest since July 21.
The onshore yuan finished domestic trade at 6.9210 per dollar, the weakest close since Aug. 20, 2020, while the offshore yuan fell to a fresh two-year low of 6.9325 per dollar.
Sterling fell to a 2–1/2-year low of $1.1649 and was last down 0.25 percent at $1.17005.
Expectations for a supersized September rate hike in the euro area also rose. ECB board member Isabel Schnabel warned on Saturday that central banks risk losing public trust and must act forcefully to curb inflation, even if that drags their economies into a recession.
"Central banks have no interest in being anything but hawkish right now, given inflation, so they will hike rates aggressively," said Nordea chief analyst Jan von Gerich.
Still, the euro was also seen held back by an energy crisis in the bloc that raises recession risks. Russian state energy giant Gazprom is expected to halt natural gas supplies to Europe from Aug. 31 to Sept. 2.
As risk-off sentiment gripped world markets, the Aussie dollar fell to $0.6838, the lowest since July 19, while the kiwi dollar hit its lowest since mid-July at $0.61.
In cryptocurrencies, Bitcoin recovered some ground but remained below the $20,000 level it dipped below at the weekend.
