AXP (American Express Company) Investment Idea
美国运通拥有一个封闭的支付网络，这是它最大的护城河。它的客户群是高端消费者和企业——这些人在经济衰退时依然消费。Charlie说过，好的生意就是那些即使傻瓜来经营也能赚钱的生意，而美国运通恰好还有优秀的管理层。
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