A bitcoin- and ether-led selloff on Monday erased some of the massive gains investors have seen this year. Of the top 40 digital currencies listed on Crypto Market Cap, 38 finished on Monday in the red. Total market caps of cryptocurrencies fell to $91 billion, a more than 20% drop from an all-time high of $117.2 billion mid-June, according to Coindesk. Read the original story from Barron's.