Borders should be permeable to all who wish to cross them, and coordinated transnationally to ensure migration does not drain certain parts of the world of a needed population while overcrowding others. 是什麼意思

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Everyone should be able to move wherever they want, but countries should coordinate with each other so that no particular place ends up with too many people or not enough people.

(This all sounds completely unrealistic to me - by definition “coordinating” to make sure not too many people go here or leave there is basically the same as having border restrictions.)