As noted last month by the Grattan Institute, an increasing proportion of immigration into Australia is relatively low-skilled, with many of these migrants working below minimum wage, thus dragging down overall wage growth across the economy:

Low-skill migrants might also put downward pressure on wages (if accurately measured). The measured wages of those aged 20 to 34 have not risen as fast as the wages of older workers for some time.


https://www.macrobusiness.com.au/2019/09/half-of-australian-temporary-visa-holders-underpaid/