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Charles Kenney compares human and cow immigration. It's an entertaining article with a serious point:

From a global perspective, it is unfortunate that cows get treated so much better at the border than people. Migration is pretty much the fastest and most reliable method for improving quality of life in the human population. Work by my colleague Michael Clemens at the Center for Global Development suggests that the same worker with the same skills doing the same job can earn six times more in the United States than in India, for example. Eight out of 10 Haitians worldwide who are living on more than $10 a day are living in the United States, leaving less than one-fifth of those relatively high earners living in Haiti itself. A lot of the income that Haitian immigrants are earning -- $1.5 billion-plus a year -- is sent home in the form of remittances. 

(Hat tip: Yglesias; Photo by Joel Saget/AFP/Getty Images)

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