答案如下 
Which one of the following is NOT a characteristic of monopolistic competition?  A) Differentiated products. B) A single seller. C) Elastic demand curves. D) Low barriers to entry and exit. 
 Your answer: B was correct!  All are characteristics of monopolistic competition except "single seller." There are many sellers or producers who face demand curves that slope downward to the right and are elastic; they sell differentiated products that permit firms to attract customers without reducing price; and there are low barriers to entry. 
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