https://www.cnbc.com/2018/05/07/moats-and-candy-elon-musk-and-warren-buffet-clash.html

Billionaires Elon Musk and Warren Buffett engaged in a war of words over the weekend.

In an earnings call last week, Tesla co-founder Musk criticized so-called "moats" but he wasn't referring to the sort of moat you'd find around a castle. Instead, he was talking about the term coined by Buffett, referring to a buffer that companies need surrounding them to help them maintain a competitive edge. According to Musk, "the pace of innovation" is more important.