Scott Morrison and his Labor rival Bill Shorten have duelled for a third and final time, but only Australians who tuned in from across the country will be able to declare who they believe was the winner.

Unlike two previous debates, the clash at the National Press Club on Wednesday night didn’t have a pool of undecided voters to cast judgement on who performed better.

That means the prime minister has gotten away without a clear win, having been beaten by Mr Shorten in the earlier bouts, but without a series of three straight losses either.

The two leaders confronted each other directly over issues including the details of Labor’s plan to tackle the cost of cancer treatment, negative gearing and the make-up of their ministries.

Liberal campaign manager Simon Birmingham, unsurprisingly, thought his boss came out on top.

“I think the prime minister put in an incredibly strong performance, demonstrating his capabilities,” he told reporters outside the event.

Maintaining a strong economy and supporting business remains in the limelight of the prime minister’s campaign, which was centred on Wednesday in Western Sydney.

Walking along a shopping strip in Burwood on Wednesday, the prime minister spoke to anyone he could about the risks he believes Labor’s tax reforms pose to the economy.

Craig Laundy is retiring from the seat of Reid, which the Liberals hold by a margin of 4.7 per cent, but the party is hoping to retain it with child psychologist Fiona Martin.

Earlier, the prime minister moved among a sea of suits at a NSW business chamber breakfast at the Western Sydney Stadium.

He used a question and answer session to ramp up his attack on unions, when asked what impact a Labor government might have on industrial relations.

“If Bill Shorten is elected, Sally McManus will now be a board member figuratively on every single one of your companies,” he told the crowd.