Billie Jean King left the United States Lawn Tennis Association because of the promoter’s refusal to compensate the female players the same as the male players. Promoter Jack Kramer (played by Bill Pullman) argues that the men are paid more because they are stronger and faster. His colleague argues it from a reservation wage standpoint, that men needed to be paid more to attract them to the circuit. King (played by Emma Stone) argued that women should be paid equally based on marginal revenue product theory since the women sell the same number of tickets as men.
This same issue has been recently discussed regarding the US men’s and women’s national soccer teams.