A manufacturer of digital music players uses a proprietary file format

A manufacturer of digital music players uses a proprietary file format that is not used by the other firms in the market.

This action by the firm may be an example of using a ________ to reduce the number of firms in the market and to maintain a relatively inelastic demand for its products. A) natural monopoly
B) positive externality
C) subsidy
D) barrier to entry

 

ANSWER

D

 

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