Tennis balls and tennis rackets are complements. If a 3 percent change in the price of a tennis racket leads to a 9 change in the quantity of tennis balls demanded, the cross elasticity of demand equals

A) 3.
B) -3.
C) 1/3.
D) -1/3.
E) 9.

B

Economics

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The supply of product X is inelastic (but not perfectly inelastic) if the price of X rises by:

A. 5 percent and quantity supplied rises by 7 percent. B. 8 percent and quantity supplied rises by 8 percent. C. 10 percent and quantity supplied remains the same. D. 7 percent and quantity supplied rises by 5 percent.

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