To Have a Monopoly in an Industry There Must Be

Multiple Choice

To have a monopoly in an industry there must be

A) barriers to entry so high that no other firms can enter the industry.
B) a patent or copyright giving the firm exclusive rights to sell a product for 20 years.
C) an inelastic demand for the industry's product.
D) a public franchise, making the monopoly the exclusive legal provider of a good or service.