Another daily-life example of how ethical egoism brings out the socially optimal outcome is competitive sports. The fact that each team is out to win produces the optimal outcome: if the players played without keeping score, or if the weaker team reaped the same rewards, the game would be boring to watch and the players would not reach their full potential. In other words, only when every player promotes their best interest (i.e. playing to win) would the best outcome ensure (i.e. we will enjoy watching the game and the players will reach their full potential) (Kao 40)