Jeremy Grantham’s skill in identifying and diagnosing the excesses in financial markets has made him a legend in the industry and an individual whose views are in high demand. But his last appearance on the business news network CNBC was uncharacteristically confrontational.The topic was digital currency bitcoin, which has fallen 40 per cent over the past year and is distinctly out of favour, justifying its legion of sceptics, including Grantham. But CNBC anchor Joe Kernan wasn’t going to make it easy for him.Subscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Fetching latest articles