Consider the Following Characteristics

Multiple Choice

Consider the following characteristics:
a. a market structure with barriers to entry
b. demand curves that are easily identified
c. firm cannot make zero profits in the long run
d. firm can reap long-run profits.
Which of the characteristics in the list above is shared by an oligopolist and a monopolist?

A) a, b, c, and d
B) a, b, and d
C) a, c, and d
D) a and d