亚马逊凭借其仓库网络，在征收消费税的州收取消费税，但是其网站上的第三方卖家则不需要缴税。
Amazon.com, with its network of warehouses, also collects sales tax in every state that charges it, though third-party sellers who use the site don't have to.
该公司还运营着类似于网上集市的服务，上面是更难以监管的第三方卖家。
The company also operates a marketplace-like service with third-party sellers who are harder to police.
由于亚马逊近40%的销售都是通过第三方卖家完成，开启支付服务将增加其中介盈利率。
Since nearly 40% of Amazon's sales are done through third-party sellers, creating a payment service increases its profitability as a middleman.
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