An influx of digital nomads and ex-pats aren’t just driving up rents, they’re stimulating the city’s black markets as well — This article originally appeared at Pirate Wire Services. If you’re looking for on-the-ground indy journalism on Latin America from a host of countries, you should consider signing up for our newsletter. In the last decade, Medellín has undergone a significant rebirth, becoming safer, more prosperous, and notably tourist-friendly — earning…