Which of the following economic identities measure degree of monopoly in an industry?
(A) Stackelberg model
(B) Concentration ratio
(C) Diffusion index
(D) Herfindahl index
(E) Elasticity reciprocal
Choose the correct answer from the options given below:
1
(A), (B) and (C) Only
2
(B), (C) and (D) Only
3
(A), (C) and (E) Only
4
(B), (D) and (E) Only