Planet Money did a great breakdown on this. Essentially it comes down to international agreements on the cost of doing the past mile of shipping for other count

Planet Money did a great breakdown on this. Essentially it comes down to international agreements on the cost of doing the past mile of shipping for other countries. https://www.npr.org/sections/money/2018/08/01/634737852/episode-857-the-postal-illuminati https://www.npr.org/sections/money/2018/08/01/634737852/epis...