https://www.cnbc.com/2017/12/13/bitcoin-dwarfs-nearly-all-bubbles-including-1929-crash-ken-fisher.html

Whether or not bitcoin is in a bubble, the cryptocurrency's performance "dwarfs" nearly all bubbles, including the 1929 stock market crash, investor Ken Fisher told CNBC on Wednesday.

Bitcoin, which has surged more than 1,500 percent this year, has many market participants warning of a bubble.