4. Given the payoff matrix (shown below) for a duopoly, consisting of Firm A and Firm B, in which each firm is considering an expanded advertising campaign, answer the following questions (all figures in the payoff matrix give changes in annual profits in millions of dollars):

a. Does Firm A have a dominant strategy?

b. Does Firm B have a dominant strategy?

c. Is there a dominant strategy equilibrium? Explain.

Figure 11.10.