When a patent for a drug product expires, the competitive structure for the drug changes from monopolistic competition to pure competition.

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When a patent for a drug product expires, it allows generic versions to enter the market, but the competitive structure typically changes from a monopoly (or monopolistic competition if there are already some alternatives) to more of a monopolistic competition rather than pure competition, due to brand loyalty, perceived quality differences, and other non-price factors.

When a Patent for a Drug Product Expires, the Competitive