A Currency Bet Nearly as Certain as Cartel Profits

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There’s a way to make a quick profit thanks to Mexico’s drug cartels. And it’s perfectly legal.

It’s a currency trade, of all things, available every day inside Mexico City’s airport, where there’s a gap of about 3 percent between rates offered at dedicated exchange houses and local banks. Dollars bought cheaply from the currency dealers can be deposited at bank windows just a few feet away for a higher rate.