Under-representation at the top of occupation-specific ladders was subsumed under the heading of ‘vertical segregation’, whereas it is now more commonly termed ‘hierarchical segregation’” (Bettio and Verashchagina, 2009, p. 32).
In the literature, vertical segregation is referred to by the “glass ceiling” which indicates towards the existence of visible or invisible obstacles that lead to a certain rarity of women in power and decision positions in public organization, enterprises