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determine if each example represents a barrier to entry or not. a. pfizer is the only firm that is legally allowed to produce and sell lipitor, a best‑selling cholesterol drug. b. debeers owns nearly all of the world's diamond mines. c. boeing already serves a large fraction of the jumbo jet market and is able to produce at a lower average cost than any potential competitors. d. tinseltown theaters shows almost all the most popular newly‑released movies.

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