And Messrs Bogle and Malkiel are right to argue that the low-cost appeal of index funds will be diluted if too many bells and whistles are added.

• 宝格先生和麦基尔是正确的，他们宣称如果过多华而不实的因素被加在指数基金上的话，它低成本的吸引力将被减弱。