MercadoLibre jumped 15% following the Thursday night release of its third-quarter financial report. The Latin American e-commerce giant reported sales gains of more than 60%, with strong performance from its core marketplace, its MercadoPago electronic payments division, and its MercadoEnvios shipping service. User counts have risen throughout MercadoLibre's coverage area, with particularly good growth figures coming from the key Brazil and Mexico markets. Some still fear that competitors from the north might seek to cash in on Latin America's promise, but MercadoLibre's first-mover advantage will be hard for any new entrant to overcome.