Is This Buffett-Backed Blue Chip Stock a Buy?

Is This Buffett-Backed Blue Chip Stock a Buy?
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Warren Buffett is an all-time great investor who has led Berkshire Hathaway to become a powerhouse since taking over the company in 1965. With an investment portfolio worth $343.2 billion, Berkshire Hathaway is loaded with some of the best businesses in the world. One of those businesses is Mastercard (NYSE: MA), which Berkshire Hathaway has a 0.4% stake in that's valued at $1.4 billion.