http://www.rba.gov.au/speeches/2017/sp-dg-2017-11-13.html  11/13  13/11/2017  Business Investment in Australia | Speeches | RBA  The other area of investment that has been robust of late has been in those parts of the economy associated with infrastructure spending. There has been a pick-up in growth of public investment in recent years.
A share of these projects have been completed by the private sector on behalf of the public sector, some of which have been recorded as private investment in the national accounts as the work occurs. [14] This has boosted investment growth, both as a direct consequence of the infrastructure spending and, increasingly, in spillovers to other parts of the economy.