If the opinion of Robert Schiller is seriously taken into account by investors from around the world, it is simply because he was the Nobel Prize in Economics in 2013. But when it comes to talking about Bitcoin, man does not chew his words. He is not seized by the craze that surrounds crypto-currencies for several months now.
Mr Schiller believes that Bitcoin is a speculative bubble that will end up exploding, even if in itself this virtual currency should not disappear.
if bubble is defined quantitatively as an exponential increase in price over a short period of time. Than yes, it is a bubble.
From a qualitative perspective I do not think it is though.
Most current holders of Bitcoin. Dont want to sell their Bitcoins.