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What are the features that are shared by monopolies, monopolistic competition, and perfect competition? Choose two

Rationale

Maximum profit occurs when marginal revenue equals marginal cost and the firm(s) can earn economic profits in the short run.

In all market structures, firms maximize profit by producing output where marginal revenue (MR) equals marginal cost (MC). Additionally, while firms in monopolies and monopolistic competition can earn economic profits in the short run, perfect competition does not allow for sustained economic profits in the long run.

A (Maximum profit occurs when marginal revenue equals marginal cost.) CORRECT

This principle applies universally across market structures, including monopolies, monopolistic competition, and perfect competition. Firms will increase production until the additional revenue from selling one more unit equals the additional cost of producing that unit, ensuring profit maximization.

B (In the long run, new firms can easily enter the market.) YOUR ANSWER

This statement is true for perfect competition but not for monopolies or monopolistic competition. In monopolistic competition, barriers to entry are lower than in monopolies, but they still exist. Therefore, this feature is not shared across all three market structures.

C (The firm(s) can earn economic profits in the short run.) CORRECT

Firms in monopolistic competition and monopolies can earn economic profits in the short run due to their market power and fewer competitive pressures. However, firms in perfect competition cannot sustain these profits in the long run due to the entry of new firms, which drives profits to zero.

D (The structure does not produce welfare-maximizing level of output.) YOUR ANSWER

While this might be true in monopolistic and monopoly markets, perfect competition is known for achieving a welfare-maximizing output level where price equals marginal cost. Thus, this statement does not uniformly apply.

E (The price of a unit is greater than the marginal cost.) YOUR ANSWER

This statement is characteristic of monopolies and monopolistic competition due to their market power, but in perfect competition, price equals marginal cost. Hence, it is not a shared feature across the three market structures.

F (In the long run, it is nearly impossible for new firms to enter.) YOUR ANSWER

This statement accurately describes monopolies, but monopolistic competition allows for some entry of new firms in the long run. Therefore, it does not reflect a commonality among all three structures.

Conclusion

In summary, monopolies, monopolistic competition, and perfect competition share the principles of profit maximization at the point where marginal revenue equals marginal cost, and the ability for firms to earn economic profits in the short run. Other features such as entry barriers and price relative to marginal cost vary significantly across these market structures, highlighting their distinct competitive dynamics.

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