If the price of bacon rises, and as a result the demand for sausage increases, this implies that these two goods are
substitutes.
If the price of tennis racquets falls, and as a result the demand for tennis balls
increases, this implies that these two goods are complements.
If the price of coffee rises, and as a result the demand for sugar falls, this implies that these two goods are
complements.
If the price of automobiles -------and as a result the demand for motorbikes falls, this implies that these two goods are substitutes
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