With the number of players recruited from country leagues increasing, the wealthier VFL clubs were gaining an advantage that metropolitan zoning and the Coulter law (salary cap) restricting player payments had prevented in the past. Country zoning was introduced in the late 1960s, and while it pushed Essendon and Geelong from the top of the ladder, it created severe inequality during the 1970s and 1980s. Between 1972 and 1987, only six of the league's twelve clubs – Carlton, Collingwood, Essendon, Hawthorn, North Melbourne and Richmond – played in Grand Finals.