Discrimination based on race, colour, sex, language, religion, political or other opinion, national or social origin, property, birth or other status is prohibited in international human rights conventions, including the International Covenant on Economic, Social and Cultural Rights (art. 2 (2)). Private providers do not respect the prohibited grounds of discrimination and violate fundamental principles of non-discrimination in human rights law: social origin, economic condition, birth or property are the preponderant factors in allowing access to private schools. It is the obligation of States to ensure the right to education without discrimination or exclusion. Privatization in education also has repercussions on girls' right to education, as families prioritize the education of boys over girls. Any scheme of "vouchers purported to provide economically disadvantaged parents the means to select a private school in fact promotes group differentiation".