The D-Lite Corporation produces a unique type of light bulb that is used in refrigerator manufacturing. D-Lite is the only maker of this light bulb, and there are no close substitutes for it. In this case, the D-Lite Corporation would be
a) an oligopoly.
b) a monopoly.
c) involved in monopolistic competition.
d) involved in perfect competition.
e) involved in a perfect oligopoly.
Answer: b) a monopoly.