Another economist portends that bitcoin is worthless.

https://www.marketwatch.com/Story/theres-a-decent-probability-bitcoin-goes-to-zero-says-vanguard-economist-2018-05-21?&siteid=yhoof2&yptr=yahoo

More and more economists are warning about bitcoin nowadays.

http://sg-stock.blogspot.sg/2018/03/bitcoin-is-only-worth-100-not-100000-in.html

http://sg-stock.blogspot.sg/2018/03/bitcoin-is-worthless.html

http://sg-stock.blogspot.sg/2018/02/world-bank-says-bitcoin-is-scam.html