Telesource and Belair are two of the largest firms in the wireless carrier market in a certain country. Together they account for more than 80% of the market.
a. Given that both firms differentiate their products, how is Nash equilibrium achieved in this market?
b. Suppose both Telesource and Belair decide to collude and set the same price. Their payoffs from cheating and colluding are given in the matrix below. What is the Nash equilibrium in this game?

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Telesource Cheat Belair eams $2 million Telesource eams S15 million Belair eams $10 million Telesource eans $10 million Collude Belair eams $12 million Collude Telesource eams $12 Belair Belair eams S15 million Telesource eams $2 million CheatT