Berkshire Hathaway's Warren Buffett says he will never invest in cryptocurrencies.
"I can say almost with certainty that cryptocurrencies will come to a bad end," Buffett told CNBC in an interview on Wednesday.
"If you're buying something because it went up yesterday or last week, that is not a good reason for buying anything - it will get you in trouble over time."
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Mr Buffett's comments come a day after JPMorgan & Chase chief executive Jamie Dimon said he regrets calling bitcoin a fraud, referring to comments he made at a banking conference in September.
Bitcoin has taken the investing world by storm, surging to a high of more than US$19,000 and created a divide on Wall Street about whether it is a legitimate financial instrument.
According to Bloomberg, Mr Buffett is the world's fourth-richest person. Forbes has him ranked second, behind only former Microsoft boss Bill Gates.