Yemen vs Oman? Similar natural endowments but huge differences in economy, why?

Yemen and Oman are neighbouring countries, with roughly the same size. What's interesting is that Oman has only 2 million people, and Yemen has 20 million ! Also the Yemen oil reserve is roughly the same size of Oman's. But the Oman per capita income is 20 times (2000%) of the Yemen level ! Really mind... show more Yemen and Oman are neighbouring countries, with roughly the same size. What's interesting is that Oman has only 2 million people, and Yemen has 20 million ! Also the Yemen oil reserve is roughly the same size of Oman's. But the Oman per capita income is 20 times (2000%) of the Yemen level !

Really mind boggling isn't it? how come there's no labor mobility between these two countries? How come the 10 times crowded yemen peeps don't migrate to Oman????
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