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When compact disc (CD) players first came on the market, they sold for over $1,000. Now they cost only $100. These facts imply that:

When compact disc (CD) players first came on the market, they sold for over $1,000. Now they cost only $100. These facts imply that:
A. the CD industry was once competitive, but is now monopolistic.
B. fewer firms produce CD players than was the case five or ten years ago.
C. the demand curve for CD players has shifted leftward.
D. the CD player industry is a decreasing-cost industry.

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