Robert Shiller, the Nobel-winning author who predicted the two biggest speculative markets in recent history, is repeating that bitcoin is in a bubble.

The cryptocurrency is “the best example right now,” Shiller told Quartz’s John Detrixhe in an interview published Tuesday. In January 2014 at the World Economic Forum in Davos, Switzerland, he called the cryptocurrency “an amazing example of a bubble,” adding that there was “no question about it.”

Bitcoin has exploded in price and popularity since then. Bitcoin was at $4,337 on Tuesday, or about 442% over its price in January 2014 of about $800 a coin.

For evidence that bitcoin is in a bubble, Shiller pointed to “a fundamental deep angst of our digitization and computers, that people wonder what their place is in this new world.” That fear gives some people a sense that they know the future and can profit from it, he told Quartz.

It’s the same kind of angst that President Donald Trump addressed while he was campaigning, Shiller said.

Shiller’s “Irrational Exuberance” is a seminal book that forecast the tech-stock and housing crashes and outlined the investor behavior that created both bubbles. The speed of bitcoin’s rally has far outpaced most recent bubbles, as the chart below shows:

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Foto: source Jeffrey Kleintop/Charles Schwab

Shiller also told Quartz that there were “aspects of a housing bubble and a stock-market bubble right now.” The cyclically adjusted price-to-earnings ratio that he popularized shows that stocks are the most expensive since the tech bubble collapsed in 2000.