Just as importantly, the profitability fears investors had after the company's third-quarter earnings report have been calmed. After plunging margins in the third quarter, the fourth quarter showed a nice rebound in operating and net margins, and credit losses looked more in line with what investors were hoping for. With a massive growth opportunity still remaining in its core businesses and several key revenue streams still in their infancy, MercadoLibre could have much more room to the upside.