Inside South America's Oil-Fueled Currency Battle

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  • Colombia's plunging peso is sucking commerce out of Ecuador
  • Venezuela crackdown roils border as smugglers seek arbitrage

What’s the best currency regime for an oil economy? It’s become a pressing question after the crude-price shock. In one corner of the Andes, three neighbors arrived at different answers -- and things are getting chaotic in the border areas where their mismatched systems meet.

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