Bitcoin's rise could replace the U.S. dollar, says Morgan Stanley's Ruchir Sharma

Ruchir Sharma, chief global strategist at Morgan Stanley Investment, says the evolving blockchain technology has led to the growth of bitcoin and as more people invest in the cryptocurrency, it poses a significant threat to the U.S. dollar. There are also significant challenges cryptocurrencies are presenting to monetary authorities around the world. He joins 'Closing Bell' to discuss.