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A little-known shipping rule continues to shape global e-commerce, giving overseas sellers a major edge and fueling debate among U.S. lawmakers and retailers.

Advertising Disclosure: When you buy something by clicking links within this article, we may earn a small commission, but it never affects the products or services we recommend. A century-old trade provision that allows packages valued under $800 to enter the United States duty-free continues to be a contentious issue in international commerce. The exemption, Section 321 of the Tariff Act of…
