Heavy-duty Rayovac flashlights are sold throughout the United States. The bulbs used in the flashlights, however, are manufactured by Philips, and the quantity of bulbs Philips sells is related to how many flashlights Rayovac manufactures. This is an example of单项选择题

A

a tying arrangement.

B

reciprocity.

C

built demand.

D

relationship marketing.

E

derived demand.

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