A recent National Bureau of Economic Research working paper highlighted what has always been popular belief. In their paper titled Buffett’s Alpha, Andrea Frazzini, David Kabiller and Lasse H Pedersen write, “Buffett’s returns appear to be neither luck nor magic, but, rather, reward for the use of leverage combined with a focus on cheap, safe, quality stocks. Decomposing Berkshire’s portfolio into ownership in publicly traded stocks versus wholly-owned private companies, we find that the former performs the best, suggesting that Buffett’s returns are more due to stock selection than to his effect on management.”