and let the cost function be Now, the worst (and only) Nash Equilibrium would be when both players defect and the resulting cost is . However, the highest social welfare occurs when both cooperate, in which case the cost is . Thus the PoA of this game will be . Since the game has a unique Nash equilibrium, the PoS is equal to the PoA and it is 5 too. Job scheduling[edit] A more natural example is