互补品是指两种商品之间存在着某种消费依存关系，即一种商品的消费必须与另一种商品的消费相配套。一般而言，某种商品互补品价格的上升，将会因为互补品需求量的下降而导致该商品需求量的下降。
如果知识产权“窃贼”如通常的那样成为了购买后续产品以及互补产品的市场，那么知识产品的生产者实际上是可以在搭便车行为中获益的。
Producers of intellectual property can actually benefit from free riding if IP "thieves" become a paying market for follow-on and complementary products, as often happens.
例如，强生创建了 BabyCenter，一家推广互补性乃至竞争性产品的独立媒体公司。
Johnson Johnson, for example, has created BabyCenter, a stand-alone media property that promotes complementary and even competitive products.
公司称这项交易将使两个公司的产品互补，借助德克·萨斯仪器公司的强大的销售力量可以提升国家半导体公司的销售业绩。
The companies said the deal would combine their complementary product portfolios and increase National Semiconductor's sales position by giving it access to Texas Instrument's large sales force.
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