MercadoLibre (MELI -0.36%), an e-commerce specialist based in Latin America, has been on fire this year, with the company's shares up by 35% since early January. That's despite the significant uncertainty and volatility stocks have experienced, which suggests that the market is impressed with MercadoLibre's financial results or prospects (or both). The market is right. MercadoLibre is firing on all cylinders and still boasts an excellent long-term outlook. The stock is not cheap -- shares are changing hands ...