By
RONALD BAILEY
A Mexican migrant to the U.S. is five times more productive than one who stays home. Why is that?
The answer is not the obvious one: This country has more machinery or tools or natural resources. Instead, according to some remarkable but largely ignored research -- by the World Bank, of all places -- it is because the average American has access to over $418,000 in intangible wealth, while the stay-at-home Mexican's intangible wealth is just $34,000.
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