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.

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Rex Moore owns shares of Berkshire Hathaway. The Motley Fool recommends Berkshire Hathaway. The Motley Fool owns shares of Berkshire Hathaway. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.