The casual investor is probably unaware of one of Berkshire Hathaway's (NYSE:BRK-A) (NYSE:BRK-B) biggest strengths.

I was in Omaha for Berkshire's annual meeting, and had the pleasure of chatting with George Washington University law professor Lawrence Cunningham. He's authored several investing-related books, including some about Berkshire and Warren Buffett. In his upcoming book, Berkshire Beyond Buffett: The Enduring Value of Values, makes the case that Berkshire will be just fine in the post-Buffett years.

In this video, I asked Cunningham about the biggest theme he's seen at these annual meetings in the past few years. His answer involves the shift from a couple of decades ago when 80% of Berkshire Hathaway's assets were made up of common-stock investments, and 20% were in operating companies. Today, that equation is exactly the opposite, and therein lies Berkshire's extremely strong position.

This is one reason we recommend buying Berkshire Hathaway
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