Bloomberg News $1,000 $2,000 or $3,000. Heck, it could be up to $10,000 by the end of the month, and carry on climbing from there. While most markets around the world are mildly positive for this year, the cryptocurrency bitcoin has gone through the roof. At $2,400 it has more than doubled in value this year alone, and it is hitting fresh highs almost every day. But hold on. Bitcoins themselves may be very new, yet that kind of price action is very old. In truth, it is starting to look like a bubble, and that should be making investors everywhere feel nervous. Why? Because it tells us that financial crazes are back. Because it will lead to overinvestment and wild speculation. And because bubbles inevitably crash — and once that happens, the losses can ripple out in unexpected ways.via