> International mail is aggregated by China post, and they pay the USPS for the last mile. This is the key point in your claim that was not clear in your top-l

> International mail is aggregated by China post, and they pay the USPS for the last mile. This is the key point in your claim that was not clear in your top-level comment, which is the source of the confusion/dispute. (I have no idea who is right.) Consider editing your top-level comment to clarify this claim (with an edit flag) and, ideally, link to somewhere that backs it up. For instance, even if you're right it probably means that China is subsidizing the shipping to the distribution point, which would be an important thing to understand.