美国的广播主要也是一种地方性媒体，所有广播广告收入的三分之二来自零售商广告。

American radio is also primarily a local medium; retailers account for about two - thirds of all radio advertising expenditures.

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但在某些情况下，某市场营销者的自有媒介会成为另一个营销者的付费媒介。比如，当某电子商务零售商出售其网站上的广告空间时。

But in some cases, one marketer's owned media become another marketer's paid media—for instance, when an e-commerce retailer sells ad space on its Web site.

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通过信件及反馈告诉零售商，他们的广告策略正在使他们业务流失。

Fight back Tell retailers, through letters and feedback, that their advertising strategies are losing them business.

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