In markets characterized by oligopoly,
a. pursuit of self-interest by profit-maximizing firms always maximizes collective profits in the market.
b. collusive agreements will always prevail.
c. collective profits are always lower with cartel arrangements than they are without cartel arrangements.
d. the oligopolists earn the highest profit when they cooperate and behave like a monopolist.

d. the oligopolists earn the highest profit when they cooperate and behave like a monopolist.

Explanation:

An oligopoly is when there are few large firms operating in an industry.

When oligopoly firms come together and agree to set a price, they are known as cartels and are acting as a monopoly. Firms in a cartel earn the highest profit because they act as a monopoly compared to when they aren't in a cartel and each firm sets their own prices to maximise profit. In a case where firms in an oligopoly do not form a cartel, they engage in price wars and other forms of competition which might make firms earn lower profits compared to when they are in a cartel.

Collusive agreements aren't always binding. Firms might have incentives to cheat on the agreement if the payoff from cheating is higher than not cheating.

I hope my answer helps you.

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