Today, many assume that more information is automatically better information. Some stock investors like to see prices not just daily, but in real-time ... all the time. As long-term investors, we at Brandes disagree. Information that leads to better understanding of the value of a holding ... that is better information. But daily stock price fluctuations include a lot of randomness and “noise.” Looking at those prices too frequently, in our opinion, may lead to unnecessary stress, and even worse, impulsive trading!   

Source: The Intelligent Investor: A Book of Practical Counsel—Revised Edition, Benjamin Graham. Updated with New Commentary by Jason Zweig (HarperCollins, 1973, 2003)