a. What are the strategies of Rogers, Bell, and Telus in the market for smartphone service? b. If Rogers, Bell, and Telus played a one-shot game, how would the outcome be different? c. Why is a tit-for-tat punishment strategy needed to get the firms out of a prisoner's dilemma? d. How would you expect the removal of the barrier to entry and the entry of many new firms to change the price and quantity of cell phone service in Canada?