Why too much diversification in your investments can be bad for your brain

Every year, investors who hang on to Warren Buffett’s words have two occasions to look forward to. One is the release of Buffett’s annual letter to the shareholders of Berkshire Hathaway, and the other is the annual shareholders’ meet of the company. The letter comes in February, and this year’s edition duly arrived on the 27th of last month. In this letter, which is generally 10-15 pages long, along with routine shareholder stuff, Buffett lays