please differentiate each discussion post & give one reference in apa format for

please differentiate each discussion post & give one reference in apa format for each post
Discussion Question 1:
Why is the behavior of an oligopolist so hard to predict? How does it differ from that of a monopolist? Briefly explain.
Also, if a monopolist has little substantial competition wouldn’t logic dictate that that there would be a portion of the Marginal revenue curve (at about the equilibrium quantity in perfect competition) where demand would be infinitely inelastic? Why or why not? Briefly explain
Discussion Questions 2:
In July 2015, the Department of Justice opened an investigation related to possible collusion and price fixing. What created the suspicion of collusion? Research this case on the internet and share some details. What is currently happening? The Airline industry is not a monopoly, there are a number of companies involved. How can an oligopolist violate antitrust laws?