Some analysts consider oligopolies to be potentially less efficient than monopoly firms because at least monopoly firms tend to be regulated. Arguments in favor of a more benign view of oligopolies include:

a. Oligopolies are self-regulating. 

b. Oligopolies can be kept in line by foreign competition. 

c. Oligopolistic industries may promote technological progress. 

d. Oligopolies may engage in limit pricing to keep out potential entrants.