Former treasury boss Ken Henry has backed the government's 10-year plan to cut the company tax rate, saying it should be done even sooner.

The Victorian government is demanding the operator of Australia's main electricity grid explain how the state came close to losing electricity during the recent extreme heatwave to ensure NSW avoided power outages, adding to calls for a wider inquiry.

The euro has plunged against the Aussie as traders position themselves around the "redenomination risk" circling the French election.

Shares claw back some early losses as investors take profits in the big miners, while the dollar takes a whack from soft business investment numbers.

Is Wall Street's spectacular record run supported by economic fundamentals, or an outbreak of exuberance? Barclays reckons it is the former, while fundies aren't so sure.

Hundreds of thousands of Australians who work on Sundays will have their take-home pay reduced after a landmark ruling by the national workplace umpire.

Australia Post chief executive Ahmed Fahour - who was criticised by Prime Minister Malcolm Turnbull for his $5.6 million salary - has resigned from the job after seven years.

When it comes to getting money out of the Packer boys, Mariah Carey could learn the veteran who has served both Kerry and James: John Alexander.

The time you spend working on a Sunday is still worth more than it is on a Saturday, but not as much as it was in the past, according to the Fair Work umpire.

Nine Entertainment Company has reported a $237 million loss in the six months to December after reducing the Nine Network's goodwill from $422 million to $162 million. 

MYOB has acquired payments processing solutions business Paycorp for $48 million and posted a 13 per cent revenue jump.

Broadband speed and performance claims, misbehaving health insurance providers and consumer guarantees are in the watchdog's sights.

Sunday is the No.1 trading day for many of Fred Harrison's grocery stores, and now he's looking forward to putting some experienced staff back on the weekend roster.

Industry heads cite global factors for surge; see the currency reaching $US2000 by the end of the year.

Reserve Bank governor Philip Lowe has no plans to cut interest rates, and worries that he did he would make an already indebted nation "more fragile".