Sheer size may be enought to offer investors some stability. The market assigns the highest values to both the biggest and the best companies. So market value is still a good indicatios of what investors most believe in.
Montgomery explains these companies in relation to the 2008 bailouts, that even underscored the significance of the old reliables. „That's one of the reasons they were blue-chip – they were too big to fail“. – John Montgomery, Bridgeway blue chips 35 Index founder