Among Berkshire Hathaway's dozens of equity holdings, (NYSE: V) and Mastercard (NYSE: MA) are two tiny positions that, combined, make up just 0.8% of the overall portfolio. But don't let that distract you from the fact that both of their shares have crushed the S 500 in the last 10 years.

It's not hard to figure out why Visa and Mastercard are two of the best businesses on the face of the planet. They benefit from the growth of digital payments, possess powerful network effects, and are incredibly profitable.

However, these companies face two key risks that investors need to be aware of. The good news, though, is that I view them as being somewhat overblown. Here's why.

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Source Fool.com