The three largest index-fund managers have grown so big that they ultimately could hamper the performance of public companies and the economy, according to research from corporate-governance scholars. The researchers—Lucian Bebchuk, professor of law, economics and finance at Harvard Law School, and Scott Hirst, a law professor at Boston University School of Law—recently published two papers that raise issues for investors. Together,…

Click here to view original web page at www.wsj.com