Nguyên tắc la liên hệ với broker rồi đặt mua.
Broker thì có ở các công ty chứng khoán, sàn giao dịch.
"When Warren Buffett got a cell phone, the first call he made was to his stockbroker at Citigroup Inc. That broker, John Freund, still remembers the conversation. According to him, it was...