Usage History of 'duopoly'

The following chart shows how frequently 'duopoly' appeared in printed materials over time. For example, the word 'duopoly' occurred 8 times in books in 1877 and 5,452 times in 2008. From 1877 to 2008, the word 'duopoly' was used a total of 159,785 times in books scanned by Google. See Reference: Google Ngram project.

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