$American Express (AXP.US)$ has been one of Berkshire Hathaway's top five holdings for many years. According to the latest 13F filing, AXP accounts for 10.41% of Berkshire Hathaway's portfolio. What are the reasons for Buffett's long-term holding of this company?
■ AXP's unique business model is key to Buffett's favor
American Express is one of only two companies in the United States (the other being Discover) that is both a card...