Answer the following questions. Be as clear and concise as possible. Try to avoid using more than three (3) typed pages for this question, double-spaced, 12-point font. a. Describe the empirical evidence showing a positive correlation between industry concentration and rate of return. Be specific as to citations. b. What criticisms have been made of this evidence? c. Does the above correlation imply that firms in profitable, concentrated industries are protected by long-lasting barriers to entry? Explain