The traffic is reflected in the disproportionately high number of federally licensed firearms dealers along the U.S. side of the border, said Robert Muggah, another of the four scholars. Of the 51,300 retail gun shops in the United States that hold federal licenses, some 6,700 of them are concentrated in the four U.S. states that border Mexico, Muggah said. On average, there are more than three gun dealers for every mile of the 1,970-mile border between the countries.In other words, they just pulled a number out of their ass.The scholars said their study was the first “empirically robust” effort to “estimate the total flow of arms” heading south from the United States. The authors said they’d determined the likely traffic to Mexico by a complex statistical formula that measured how close a federally licensed dealer was to the Mexican border, then factored out likely local legal demand, based on population and income.


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