Suppose Nike and Adidas spend enormous sums of money every year to promote their athletic wear, hoping to steal customers from each other. Furthermore, assume each year they have to decide whether or not they should spend more money on advertising. If neither firm advertises, each of them will earn $5 million. If both advertise, each will earn $2 million in profit. If one firm advertises and the other does not, the firm with the promotions will earn a profit of $3 million and the other firm will earn $0.5 million. Use a payoff matrix to model this problem.