Colombian industrial designer Carlos Maya grabs his luggage, steps off the plane and, like other passengers arriving in Mexico City, heads straight for the immigration line. But Maya’s Colombian passport only gets a quick review, a stamp, and that’s it — no visa required. He’s free to stay for half a year. Why’s he in Mexico? Maya’s selling machinery, and hopes to make a killing under a new trade deal uniting Mexico, Colombia, Peru and Chile. Continue reading on Ozy…