Both Pepsi and coca cola are a duopoly.
Duopoly is a market that is competitive and in this market in two different companies selling almost similar products sell their product to Large number of consumers because they have large consumer base.
In a duopoly market the producer are the determinant of the market price of the product they sell to consumer and the beverage companies are known to control about seventy five percent of the market.
Therefore Pepsi and Coca cola are a duopoly.
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