Bill Shorten has been forced to admit he made a mistake when he ruled out Labor making any changes to superannuation concessions.
The opposition leader said he thought he was being asked on Tuesday about further plans to change superannuation, beyond Labor's existing pledge to reduce tax concessions for super contributions.
"I thought I was being asked about 'have we got any unannounced changes to superannuation'," Mr Shorten told reporters on Wednesday.
"But obviously we have changes which we outlined three years ago, so I should have picked the words better, no question.
"We have no proposals other than what we've announced previously."
Under Labor's proposed changes, more than one million Australians could pay more tax on their super contributions.
And, a day after refusing to answer questions on the cost of Labor's climate and energy policies, Mr Shorten used economic modelling to say they would actually help the economy grow.
He says ANU economist Warwick McKibbin has found the opposition's target to reduce carbon emissions by 45 per cent by 2030 would not be a cost on the economy.
The coalition has an emissions reduction target of 26 per cent.
Mr Shorten maintains that under both targets, Dr McKibbin's modelling shows Australia's economy would continue to grow at a rate of 23 per cent throughout the 2020s.
"Our economy is going to grow, I don't accept the characterisation that it's a cost," he told reporters in Perth on Wednesday.
But senior coalition minister Simon Birmingham says Mr Shorten's comments are misleading, as Dr McKibbin said his modelling "did not examine Labor policy".
On day seven of the election campaign the opposition leader continued his focus on health when he visited Midland Hospital in Perth to announce $20 million to make it easier for blood cancer patients to access drug trials.
"Part of the problem is that while game-changing treatments are being developed, they are often too slow to get to patients when they need it most," Mr Shorten said.
The announcement is part of Labor's $2.3 billion investment in Medicare and cancer research, which the party is counting on to win votes in the May election.
Mr Shorten was in Liberal MP Ken Wyatt's seat of Hasluck, as the Labor leader continues his campaign in Liberal seats.
He also addressed workers at Volgren, a bus construction company, in Labor MP Anne Aly's marginal seat of Cowan.
Mr Shorten talked about Labor's plans to increase apprenticeships and back local manufacturing, as well as efforts to make cancer scans and specialist appointments bulk billed.
Auto-electrician Brandon said the pledge to lift apprenticeship numbers was important.
"That's the first real thing I've heard from any campaign, I don't follow the news all that much anyway," he told AAP.
"In terms of healthcare, jobs and wages, it's all good."