According to the article, Dropbox raised capital at a valuation equal to 25x sales, even though Box is trading for 7x sales. Whether "irrational" or not, the p

According to the article, Dropbox raised capital at a valuation equal to 25x sales, even though Box is trading for 7x sales. Whether "irrational" or not, the private-market valuation multiples of "unicorns" like Dropbox are much greater than those of similar public companies like Box.