The US dollar rose against a basket of currencies for a third day on Thursday, as worries about the economic fallout from the coronavirus boosted dollar demand despite recent steps by world central banks aimed at alleviating market stress.
The dollar index, which measures the greenback's strength against a basket of six other major currencies, rose about 1.0% to 101.76, its highest since January 2017. The index is up about 3% for the week.
"The dollar's strength is, in effect, a powerful short-covering rally," said Marc Chandler, chief market strategist at Bannockburn Global Forex.
"It was used to fund a great part of the global circuit of capital. The circuit of capital is in reverse now, and the funding currency is being bought back," Chandler said.
The dollar's rally has crushed several currencies to multi-year lows. The euro was 1.31% lower at $1.077, its weakest since April 2017, as traders rushed to dump euro positions despite a fresh round of stimulus from the European Central Bank.
Though the European Central Bank announced a 750 billion euro ($817 billion) asset-purchase programme in response to the coronavirus outbreak, currency traders were not impressed.
"While the ECB's announcement has helped the bond market, it has done little for the euro," said Chandler.
The ECB's purchase scheme, announced after an emergency meeting late on Wednesday, came less than a week after policymakers launched fresh stimulus measures.
The fall in the euro mirrored a sudden widening in FX implied borrowing costs for the US dollar, indicating that investors were rushing to secure their short-dated funding.
"There are still fears about refinancing of European debt in US dollars," said Ulrich Leuchtmann, head of FX and commodity research.
"The swap facilities should normally give access to euro funding. But I think this is not calming down the market. There's a general assumption that there are a lot of US funding needs, not just in Europe but also around the world as a whole."
The British pound rallied 1.11% after the Bank of England cut interest rates to 0.1% and ramped up its bond-buying program.