When investing in a stock, invest not just money but also your time doing this

In some of my last few columns in these pages, I had been on a sort of Buffett-and-Munger roll, quoting and expounding on the wisdom on offer in a recent video and letter. The video is the annual shareholders’ meet of a small company named Daily Journal and the letter is of course the annual letter to the shareholders of Berkshire Hathaway from Chairman Buffett. This time, I have a gem from Charlie Munger which is about business school