Consider a sporting goods company whose two main products are golf balls and tennis balls. To the right, S1 is the supply curve for golf balls

   Suppose the price of tennis balls falls, perhaps due to a reduced popularity of the sport or for some other reason. In any case, a reduction in the market price of tennis balls makes the production and sale of golf balls relatively more profitable. In other words, the opportunity cost of producing golf balls has fallen. This alters the relationship between the desired quantity supplied and the market price for golf balls, causing supply to shift out or to increase from S1 to S2. Therefore, because the market price of tennis balls changed, the supply curve for golf balls shifted.

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