Job site Seek has seen a big jump in the number casual roles listed on its website, as an economist says uncertain economic times are making businesses reluctant to hire full time staff. In theory, casual contracts offer flexibility for employer and employee, and work is available as and when it suits both parties - but no hours are guaranteed. Some workers also say the benefits can be stacked in favour of the employer, and the fluctuating hours make it difficult to get by. Luka Forman with this report.