A $60 billion investing firm breaks down why a force that's helped the market's biggest companies fo

Ben Inker, the head of asset allocation for Grantham, Mayo, & van Otterloo, says the 50 biggest US companies have become dramatically more profitable in recent decades, but that's beginning to change — with profits for those companies gradually returning to normal levels. The steadily rising profitability for mega-cap companies gave them an edge over all other stocks that lasted for decades, but Inker argues that it's not a permanent change. He argues that the end of that trend makes US...