This prohibition does not apply where the difference in the rate of pay is made on the basis of any objective factor other than sex, employment status or assignment employee status. (hicksmorley.com)
This is why it might be a good idea to limit the number of assignments employees receive. (entrepreneur.com)
Effective January 1, 2018, temporary help agencies must provide an assignment employee with one week's written notice or pay in lieu if an assignment that was estimated to last for three months or more is terminated before the end of its estimated term unless another assignment lasting at least one week is offered to the employee. (slaw.ca)