A Mexican soldier stands guard next to marijuana packages in Tijuana following the discovery of a tunnel under the U.S.-Mexico border in 2010.
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The cartels' business models are similar to those of big-box stores and franchises, says Tom Wainwright, former Mexico City bureau chief for The Economist. His new book is Narconomics.
A Mexican soldier stands guard next to marijuana packages in Tijuana following the discovery of a tunnel under the U.S.-Mexico border in 2010.
AFP/AFP/Getty Images
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