In the following video, Motley Fool financial analyst Matt Koppenheffer talks about the top two holdings in his own personal portfolio, Wal-Mart (WMT -0.14%) and Berkshire Hathaway (BRK.B 0.74%). He tells us why he thinks Wal-Mart's competitive moat is an enduring one and what he likes about the structure of giant Berkshire Hathaway.
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