Casuals - now that the goalposts are shifted by ratty on uppers:
While part-time employment encompasses a range of actual hours worked, part-time employees work an average of 17 hours per week. More than half of Australia's part-time workers are casually employed, compared with 10 per cent of full-time workers. Casual employment is defined here as employment with no paid holiday or sick leave. Perhaps somewhat surprisingly given the continued upward trend in the part-time employment share, the share of casual employees in the workforce has been relatively stable since the 1990s at around 20 per cent. The share of independent contractors working part time is around 40 per cent. Independent contractors own their own business and are contracted to perform services by a client; they represent close to 10 per cent of employment.
Relative to other age groups, older workers (particularly those aged 55 years and over) have the strongest preference for working part-time hours. It may be that older workers take on a part-time job (and, increasingly, casual arrangements) as a transition between the role they had for most of their working life and retirement. Older workers also cite caring for relatives and illnesses or disabilities as reasons for working part time. In addition, an older worker's decision to work part-time hours can be influenced by access to, and the level of, pensions and superannuation.
Data from the HILDA Survey suggest that, on average, a little less than 20 per cent of part-time workers switch to full-time employment each year. In contrast, less than 10 per cent of full-time workers switch to part-time work on average each year. As previously mentioned, many young people combine part-time work and study, while unemployed workers more commonly transition to part-time (particularly casual) jobs rather than full-time work. This provides some evidence that part-time work can be used as a stepping stone into full-time employment.
https://www.rba.gov.au/publications/bulletin/2017/sep/3.htmlSee also
Why there's more jobs and fewer applicants than ever before
https://www.savings.com.au/news/more-jobs-than-ever-before