Temple University Department of Economics

Economics 92 Principles of Microeconomics, Honors

Homework 6 Mixed Strategies

Name

A. Market Niche is important to any firm since it confirms a certain degree of market power and pricing discretion. This is a problem about entry and market niche; and it is a first problem in mixed strategy.

1. Does Miss Anne Thrope have a dominant strategy?

2. Does Andy Royd have a dominant strategy?

3. Using "best response", how many pure strategy equilibria are there?

4. With what probability should Andy Royd play "Enter?"

5. With what probability should Miss Anne Thrope play "Stay Out?"

6. What is the expected payoff to Andy Royd from playing the mixed strategy?

7. What percent of the time will too many firms enter the robot market?

8. In the sense of maximizing total payoff to all players, is the mixed strategy solution that you have found an efficient outcome? Yes No

9. In the sense that on average each player does as well as the other, is the mixed strategy solution fair? Yes No

10. Is there a way to reconcile fairness and efficiency? Yes No

B. Video System Coordination (VHS v. Beta) was a problem when VCR's were first introduced. A similar problem emerged with DVD and high density TV so it is worth looking closely at coordination games and mixed strategies. Sony and Panasonic can choose from either of two formats, VHS or Beta. If they use the same format then they are better off. If they use different formats then no one is better off. They payoffs can be summarized as

11. There are two pure strategy equilibria in this game. What are they?

12. Are the pure strategy solutions fair in the sense of equal payoffs? Yes No

13. Are the pure strategy solutions efficient? Yes No

14. With what probability should Sony play Beta in a mixed strategy?

15. What is Sony's expected payoff in the mixed strategy solution?

16. Is the mixed strategy solution to the game fair in the sense of both players getting the same payoff? Yes No

17. Is the mixed strategy solution to the game efficient in the sense of maximizing the total payoff for all players? Yes No

C. Sales are foremost in our minds now that the Christmas shopping season is behind us. With expansion of retail outlets and the poor results of the season Anna Conda, the VP for Sales and Marketing, must decide on a new strategy: Periodic sales or 'everyday low prices.' When Conda's firm has a sale they pick up new informed buyers who were waiting for a price drop, as well as winning customers from their rival. If both firms have a sale the Anna is worse off. If Anna holds her price when Turnitif has a sale then she will pick up some customers who want her trademark. Anna Conda's research assistant has determined that payoffs in their retail market are

18. Does Conda have a dominant strategy? Yes No

19. Does Turnitif have a dominant strategy? Yes No

20. Is there an equilibrium in pure strategies? Yes No

21. If Anna Conda starts a new campaign in which she promises sale prices all of the time what will be her profits?

22. Is there a mixed strategy equilibrium? If your answer is yes then fill in the blanks: