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Firing back at Musk's comments, Buffett said, "I don't think he'd want to take us on in candy".

The mind Tesla and exploration company SpaceX, Elon Musk is indeed one of the most successful entrepreneurs and investors in the world and people are already debating over the idea as to what will make Elon Musk's candy company special?

Musk, who'd been kind of quiet on Twitter, revealed he plans to get into the candy game ... so any references he makes to Mars will likely need further clarification.

"I'm starting a candy company & it's going to be awesome", posted Elon Musk on Twitter. "I don't think he'd want to take us on in candy", the Berkshire Hathaway (BRK.A) CEO said Saturday during the conglomerate's annual meeting in Omaha.

During a quarterly earnings call last week, Musk dismissed the concept of moats. "They are like nice in a sort of quaint, vestigial way".

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While there's always a chance Musk was simply off firing off late night tweets to test out some of his business ideas with the public, the billionaire later posted that he is "super super serious", about the venture. If your only defense against invading armies is a moat, you will not last long.

Buffett, however, is the champion of the moat concept. "What matters is the pace of innovation, that is the fundamental determinant of competitiveness".

Buffett responded over the weekend by saying that moats are still working for certain companies, despite technological advancements.

While Buffett said it did seem like more moats had become susceptible to invasion recently, he still observed plenty of companies, such as the See's sweets unit that Berkshire owns, where they were holding firm. The YouTuber is not impressed with the billionaire's recent freaky tweetstorm about starting a candy company and Musk's joking that we are living in a real life "Westworld", a reference to the HBO show about rebellious robots.