一些人已经讨论说，一旦一名消费者从一个自有体系的商店中购买了一部音乐作品，它们就永远地被锁定到那家公司唯一指定的音乐播放器上了。

Some have argued that once a consumerpurchases a body of music from one of the proprietary music stores, they areforever locked into only using music players from that one company.

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正式的表述是，对于给定的物品X，互补品是指那些一旦被消费会便会增加X的价值的商品。 如此，计算机的使用增加了如打印机和显示器这样的外围设备的价值。

Formally, for a given good X, acomplement is a good whose consumption increases the value of X. Thus, the use of computers increases thevalue of peripheral devices like printers and monitors.

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