Determine if each example represents a barrier to entryor not.

Is an example of a barrier to entryIs not an example of abarrier to entry

Answer Bank

Boeing already serves a large fraction of the jumbo jet marketand is able to produce at a lower average cost than anypotential competitors.

Tinseltown Theaters shows almost all the most popularnewly?released movies.

Pfizer is the only firm that is legally allowed to produce andsell Lipitor, a best?selling cholesterol drug.

DeBeers owns nearly all of the world's diamond mines.