Ruchir Sharma: digital currency poses a significant threat to greenback’s supremacy. "The pandemic has made those crypto-pitches sound less like pure digital hype. Fearful that central banks led by the US Federal Reserve are debasing the value of their currencies, many people have bought bitcoin in bulk. Its price has more than quadrupled since March, making it one of the hottest investments of 2020." The Morgan Stanley Investment Management’s chief global strategist and author of "Ten Rules of Successful Nations" analyses in the Financial Times.