I don't think we're in a bubble until we cross $742.
Why $742 again? Is that a historical or technical price to look for?
That's the number that I've come up with using regression analysis.
Interesting, thanks. I'll definitely remember that number if we approach it anytime soon.
Take a look at the "Current Trend Price" on http://cryptocoinstats.com/priceforecaster.php
That's the price we should be at today if the price followed a perfect regression line. In theory anytime we are below the line BTC is undervalued and above the line is a bubble. That is, if everything else remains constant.