In some cases, firms hired workers from overseas https://www.rba.gov.au/speeches/2021/sp-gov-2021-07-08.html  7/17  7/8/2021  The Labour Market and Monetary Policy | Speeches | RBA  directly to fill specific gaps, but in other cases they hired people who were already in Australia for other reasons, including to study and on working holidays.
It is useful to distinguish the effects of this ability to draw on overseas labour markets from the impact of immigration more broadly. Immigration adds to both the supply of, and demand for, labour: when immigrants work they supply labour and their consumption of goods and services adds to the demand for labour.