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They only pay 8 dollar a month as far as I heard. We need something with 3-5 dollar a day to cover food and drinking.

C'est la vie. I think around $10k per year in the US would be good outside of places like CA or NYC where everyone wants to live. The developing world could be much lower. Hopefully a minimum income would help equalize labor rates and realize a more competitive world where absent transportation costs equally productive work is paid equally.