In: Economics
a)Describe the Herfinderhl Index, what does it measure?
(b) Assume that the demand is linear; P(Q) = A-bQ, where Q = ∑qi from i=1 to N (A and b are parameters). Suppose also that there are N firms and all firms have the same cost function, C = cqi Marginal cost is constant and equal to c. Find the Cournout equilibrium.