One piece of evidence in support of this is the responses to the NAB survey I showed earlier. There has been a sharp increase in the share of firms reporting the availability of labour as a constraint (Graph 6).
The only other time in the past 25 years where this share has been as high as it is now was in the early  http://www.rba.gov.au/speeches/2018/sp-gov-2018-06-13.html  9/15  13/06/2018  Productivity, Wages and Prosperity | Speeches | RBA  stages of the resources boom. These survey results are consistent with what the RBA is hearing through our own business liaison program.