This study examines the impact of a very large and sudden deregulation of tuition fees in Ontario professional programs in the late 1990s. The findings suggest that the enrolment gap between students from higher and lower socio-economic backgrounds rose substantially in Ontario, where the deregulation of professional programs was more prominent. In provinces like Quebec and British Columbia, where tuition fees remained stable, no change in the enrolment gap was registered. (emphasis added)
Full Study at StatsCan.