Pharmaceutical company that produces a product that is with patent protection and are a monopoly. Explain why they are considered a oligopoly How has the costly requirements of research and development along with patent protection affected the market structure of the pharmaceutical industry before covid-19?

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Pharmaceutical company that produces a product that is with patent protection and are a monopoly. Explain why they are considered a oligopoly How has the costly requirements of research and development along with patent protection affected the market structure of the pharmaceutical industry before covid-19?