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It is not surprising. Immigrants from Nigeria are the best educated immigrant group and income correlates with education.

I agree with you, thanks for the source.

Glad to provide it. I am not sure why you are getting downvoted. Asking for a source is GOOD and Hacker News public should understand that.

I guess some people read my question as if I doubted while I just wanted the source which I didn't have.

C'est la vie :)