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Bridgewater Associates founder Ray Dalio said Tuesday he is not a believer in cryptocurrencies.
"It's not an effective storehold of wealth because it has volatility to it, unlike gold," the hedge fund founder added. "Bitcoin is a highly speculative market. Bitcoin is a bubble."
The investor said there are two important facets to being considered a valid currency: ease of transactions as a medium of exchange and being a "storehold of wealth."
"It's a shame, it could be a currency. It could work conceptually, but the amount of speculation that is going on and the lack of transactions [hurts it]," he said.
Dalio wrote about his life lessons and the initial failures during his career in his book entitled "Principles: Life and Work," available on Tuesday.
His firm currently manages about $160 billion, according to its website.
Dalio's negative comments come a week after JPMorgan Chase CEO Jamie Dimon also took a shot at bitcoin, saying the cryptocurrency "is a fraud."
"It's just not a real thing, eventually it will be closed," Dimon said at the Delivering Alpha conference presented by CNBC and Institutional Investor.