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. barrier to entry b. DeBeers owns nearly all of the world's diamond mines. barrier to entry 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. barrier to entry not a barrier to entry - d. Tinseltown Theaters shows almost all the most popular newly-released movies.

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