Explanation
Professor A.P. Lerner has put forward a measure of monopoly power which has gained great popularity and is most widely cited. Lerner takes perfect competition as the basis of departure for measuring monopoly power.
He regards pure or perfect competition as the state of social optimum or maximum welfare and any departure from it would indicate the presence of some monopoly power leading to misallocation of resources or state of less than social optimum.
Please disable the adBlock and continue. Thank you.