It refers to Bitcoin as a "smart idea" to the 2018 World Economic Forum in Davos, Switzerland. Robert Schiller is a professor of Yale economics who won the Nobel Prize for an empirical analysis of property prices. One of these is that they continue to think even though in spite of their doubts. What has started showing interest, despite the negativity, stems from Nobel economists who move towards Davos and have a holder.
Source - https://www.ccn.com/shiller-shows-poise-calls-bitcoin-a-clever-idea/