One of the Prime Ministers top advisors, David Gruen, warned that economically marginalised communities must be taken seriously or Australia will face a political backlash that threatens the established economic order.

Gruen, the deputy secretary of the Department of Prime Minister and Cabinet, was backed by Treasury secretary John Fraser on Wednesday, who added the market was failing to come up with solutions to inequality and the government must be prepared to deliver policy solutions.

"We have a duty in government to support the poorest and weakest in the community - we need to be very mindful as economists and policy makers that we don't blithely say the market will fix it," Mr Fraser said.