Market forces is a broad term. Historically, market forces have been influenced by factors such as occupational segregation of work and gender-biased stereotypes. While labour shortages can be and have been, under the Equal Wages Guidelines and the Canadian Human Rights Act, considered in determining whether a wage gap is discriminatory, other factors that influence labour markets should not be taken into account in the valuation of the work.
“Market forces”, with this broad meaning, are not immune to the occupational segregation of work and these gender-based stereotypes, so we can't allow market forces to dictate the value of the work that's being performed.