Asian shares slid on Monday and oil prices took another tumble as fears mounted that the global shutdown for the coronavirus could last for months, doing untold harm to economies.
"We continue to mark down 1H20 global GDP forecasts as our assessment of both the global pandemic's reach and the damage related to necessary containment policies has increased," said JPMorgan economist Bruce Kasman.
They now predict global GDP could fall at a 10.5% annualised rate in the first half of the year.
There was much uncertainty about whether funds would have to buy or sell for month and quarter end to meet their benchmarks, many of which would have been thrown out of whack by the wild market swings seen over March.
E-Mini futures for the S&P 500 skidded 1.2% right from the bell, and Japan's Nikkei 3.2%.
MSCI's broadest index of Asia-Pacific shares outside Japan eased 0.2%, while South Korea shed 2.7%.
Central banks have mounted an all-out effort to bolster activity with rate cuts and massive asset-buying campaigns, which has at least eased liquidity strains in markets.
Canada's central bank on Friday surprised many with an emergency rate cut to 0.25% and a program of quantitative easing, while New Zealand policy makers on Monday launched a loan program for corporates to meet liquidity needs.
Rodrigo Catril, a senior FX strategist at NAB, said the main question for markets was whether all the stimulus would be enough to help the global economy withstand the shock.
"To answer this question, one needs to know the magnitudeÂ of the containment measures and for how long they will be implemented," he added. "This is the big unknown and it suggests markets are likely to remain volatile until this uncertainty is resolved."
It was not encouraging, then, that British authorities were warning lockdown measures could last months.
While President Donald Trump had talked about reopening the U.S. economy for Easter, on Sunday he extended guidelines for social restrictions to April 30.
Japan on Monday expanded its entry ban to include citizens travelling from the United States, China, South Korea and most of Europe.
DOLLAR NOT DONE YET
Bond investors looked to be bracing for a long haul with yields at the very short end of the Treasury curve turning negative and those on 10-year notes dropping a steep 26 basis points last week to last stand at 0.66%.
That drop has combined with efforts by the Federal Reserve to pump more U.S. dollars into markets, and dragged the currency off recent highs.
Indeed, the dollar suffered its biggest weekly decline in more than a decade last week.
Against the yen, the dollar was pinned at 107.44, well off the recent high at 111.71. The euro was firm at $1.1126 after rallying more than 4% last week.
"Ultimately, we expect the USD will soon reassert itself as one of the strongest currencies," argued analysts at CBA, noting the dollar's role as the world's reserve currency made it a countercyclical hedge for investors.
"This means the dollar can rise because of the deteriorating global economic outlook, irrespective of the high likelihood the U.S. is also in recession."
For now, the dollar's retreat provided a fillip for gold, which was up 0.3% on Monday at $1,622.50 an ounce.
But it has been little help for oil as Saudi Arabia and Russia show no signs of backing down in their price war.
Brent crude futures lost $1.45 to $23.48 a barrel, while U.S. crude fell 91 cents to $20.60.