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However, it’s actually no secret as to how the Chinese are able to ship products abroad so cheaply. The reason is actually rather simple: They receive subsidized postage rates.
https://www.forbes.com/sites/wadeshepard/2017/11/05/how-the-usps-epacket-gives-postal-subsidies-to-chinese-e-commerce-merchants-to-ship-to-the-usa-cheap/#4af4b84140ca