Bitcoin's 'bubble' is unlike anything we've ever seen

There are still some question marks about whether bitcoin is in a bubble. But the speed of its price growth is already nearly unmatched.
The cryptocurrency has surged 162% in very volatile trading this year amid continued demand. But as the chart below illustrates, bitcoin's longer-term rally by as much as 1,000% was swifter than homebuilder stocks in the lead up to the housing crash. 
Jeffrey Kleintop, the chief global investment strategist at Charles Schwab, said that "the