Frazzini, Andrea; Pedersen, Lasse Heje; Kabiller, David - National Bureau of Economic Research (NBER) - 2013
Berkshire Hathaway has realized a Sharpe ratio of 0.76, higher than any other stock or mutual fund with a history of more than 30 years, and Berkshire has a significant alpha to traditional risk factors. However, we find that the alpha becomes insignificant when controlling for exposures to...