Hyman Minsky he believes that Bitcoin is has five stages: displacement, boom, euphoria, profit taking and panic. Policy adviser at the Federal Reserve Bank of San Francisco, Joost van der Burgt, says that if Bitcoin is in fact a bubble, its likely at the beginning of the profit-taking stage, meaning that panic is not here yet. But he does admit that he might be wrong about Bitcoin being a bubble and states that it could become "a new global currency". https://www.newsbtc.com/2018/06/03/according-to-economist-joost-van-der-burgt-if-bitcoin-is-a-bubble-the-final-stage-of-panic-is-on-the-horizon/