The dollar slipped on Friday as investors defied a broader sense of doom around upcoming United States (US) employment data and found reasons to buy riskier currencies with more governments slowly reopening their economies for business.

The greenback was undermined by a further hit to its yield attraction as US money markets priced in a small chance of negative interest rates next year.

The dollar's index against a basket of six other major currencies slipped to 99.829 from Thursday's high of 100.40.

The euro edged back to $1.0835 from Thursday's near two-week low of $1.07665 though it was down about 1.3 per cent on the week.

The Australian dollar traded at $0.6505 after a gain of nearly 1.5 per cent in the previous session.

The dollar's retreat against riskier currencies reflected a recovery in risk sentiment as global shares rallied, with Nasdaq index now wiping out its losses this year.

On top of aggressive monetary easing around the world, hopes of economic normalisation are supporting the mood as some countries in Europe and parts of the United States ease restrictions on economic activity.

Against the safe-haven yen, the dollar bounced back to 106.295 yen, from a seven-week low of 105.985 touched on Wednesday.

The greenback was also caught off guard as US short-term bond yields hit record low with markets starting to price in negative US interest rates for the first time.

Although Federal Reserve officials have said that they do not see negative rates as appropriate, the price action suggested some investors see a much worse downturn that could force the Fed to become more experimental with its crisis response.

Data on Thursday showed 3.169 million initial unemployment claims for the week ended May 2, more than economists' forecast of 3 million, and bringing total claims since late March to 33.5 million, or about one in every five workers.

The unemployment data due later in the day is expected to show a historic hit to the US labour market.

Nonfarm payrolls are forecast to have plunged 22 million in April, which would blow away the record dive of 800,000 seen during the 2007-2009 recession.

The unemployment rate is seen jumping to 16 per cent in April, which would shatter the post-World War Two record of 10.8 per cent touched in November 1982.

Some traders sold dollars to take profits ahead of the data.

“Everyone knows it is going to be terrible and people are focusing on the pace of a rebound from there,” said Ayako Sera, market strategist at Sumitomo Mitsui Trust Bank.

“But because this is an unprecedented pattern, you cannot find any historical example, and where there is no example, even artificial intelligence cannot find an answer,” said Sera.

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