Brilliant article!

However, with due respect, I disagree that we as investment managers should turn off the Bloomberg screen. As written by Seth Klarman in chapter 13 of his famous book Margin of Safety, investors should always stay in touch with the market. From my fund management experience, some great opportunities come and go really fast, especially in this efficient era (not saying the market is fully efficient though). Example: there was a great stock in my market dropped 15% with huge volume in the final 3 hours of a trading day despite it has very sound fundamentals, many fund managers were either half asleep or not brave enough to buy in. Not only the stock recovered 18% the next day, it gained 46% in a month. Mr Market is much smarter nowadays.

Yes, the temptation of doing something by gluing yourself to the market movements is often very strong, that's why investment process or checklist is very importantly in decision making. That said, avoiding the Bloomberg screen altogether is not the most rational thing to do, knowing what you are doing is.

But I'm all in for NOT checking portfolio performance everyday/month. Great quote from Warren Bufett -- “Games are won by players who focus on the field, not the ones looking at the scoreboard.”