Explain the difference between a four firm concentration ratio,
a Herfindahl-Hirschman Index, a Lerner index, and a Rothschild
index.
Based on the information given below, indicate for each of the
following, whether the industry is best characterized by the model
of perfect competition, monopoly, monopolistic competition, or
oligopoly.
a) Industry A has a four-firm concentration ratio of 0.005% and
an HHI of 75. A representative firm has a Lerner index of 0.45 and
a Rothschild index of 0.34.
b) Industry...