Dayuhan, the last quote isn't mine.
The easiest way to look at it is to look at the goods trade balance of the UK in the late 19th century.
The human capital export was no doubt considerable, but that human capital was -once exported- sustained (fed) by foreigners, so this could be treated like migration.
Germany - which only colonised the poor countries which were left by the late 19th century save for Abyssinia - had a clearly negative cost/benefit result. The colonies costed many times as much as they generated income.
We got rid of at least some assholes, though.
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