Warren Buffett has invested in numerous companies throughout his illustrious career. His unbelievable track record has made him a widely followed investor for many market participants.

But of the dozens of stocks the Oracle of Omaha owns in the massive Berkshire Hathaway public equities portfolio, I'm most excited about Mastercard (NYSE: MA). Here's why.

Anyone who has paid any attention to Warren Buffett's words over the years knows all too well that, above all else, he looks for businesses with an economic moat. A company possesses an economic moat if it has one or more competitive advantages that help protect it from the threat of competition. If a business can fend off existing rivals and new entrants into its industry, the thinking is that it should earn outsize financial returns.

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Source Fool.com