Unemployment remains at 5% in Australia because it provides a competative job market for companies. This, in turn, increases domestic and international investment in australian companies. It could be argued unemployment helps the society under capitalism
Couldnt find the link I wanted, but this article expresses the murdoch / state explanation of unemployment and inflation
https://www.smh.com.au/business/few-good-reasons-why-5-unemployment-is-considered-full-employment-20100709-1047v.html