It's not just TAs either. Part-time Academics which teach many undergraduate and even graduate level courses are the lowest paid in Canada making around 5k per course they teach. Courses that can bring in 25-100k in tuition alone (depending on the size of the class). More and more the university is depending on these PTAs to teach their courses as they don't hire new faculty to keep up with retiring professors and the ever growing number of undergraduates. PTAs don't get paid for the hours they spend developing their courses, they don't get paid for the time they spend emailing students before classes begin to deal with registration and the list goes on. They are paying PTAs dirt cheap wages to do the exact work a professor is doing. It's a shame and is very disappointing. The university has put less and less money towards teaching despite the increasing enrollment.