2. Short Questions. Explain your answer briefly. (5 points each, 10 points total) a. Let us group all the stocks in the market into 10 equal deciles based on the stocks' past 6 month returns. Economists have found that longing the best-performing group and shorting the worst-performing group is a profitable trading strategy. This is called the momentum strategy. Which form of market efficiency does the existence of momentum support or contradict? Explain your answer. b. In mergers and acquisitions, on average, sellers earn higher returns than buyers. What are the reasons for this phenomenon