The central bank has hiked by an aggressive 575 basis points so far this year in its battle against inflation, with more expected to come, and analysts warn this could choke economic growth. Lender Itau Unibanco ITUB4.SA said it had received central bank approval to buy an 11.38% stake in brokerage XP Inc XP.O. The currency of the world's top copper exporter, Chile CLP= firmed 0.3% after its central bank said revenues from copper exports amounted to $4.481 billion in October, up 23% versus a year earlier, helped by high global prices.