a.The Australian supermarket industry is dominated by two firms; Coles and Woolworths. Assume the supermarket market is worth $30 billion per year. This is stable year on year regardless of the level of marketing activity. Market share is 50/50 between the two firms. Neither firm currently spends any money on advertising. The cost of marketing activity is $5 billion for any firm. Assume that if both firms advertise that market share remains the same, but if one firm advertises and the other doesn't that market is 70/30 with the advertiser gaining more sales.

Draw the payoff matrix to show profit results for all possible outcomes