When there is a rapid growth in any of the crypto-currencies and assets such as Bitcoin, Ether, Zcash and others, many will call it out as a bubble. Indeed, on a relatively short time scale it clearly looks like a bubble.
The entire crypto-currency market capitalisation currently stands at around US$100 billion; it was US$60 billion one month ago. But Bitcoin was worth 1/100 of a US cent in June of 2009, 7 cents in June 2010, and US $7 in June of 2012.
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