The Math of Stock Picking Works Against Active Managers

The concentration of gains in a minority of index fund holdings—a statistical concept called positive skew—makes it extremely difficult for active managers to beat benchmarks, according to a recent Bloomberg article. Research conducted in 2015 found that “the distribution of returns in the stock market is bizarrely lopsided,” the article argues. “It’s a pattern of returns that virtually ensures everyone outside of an indexer owns mostly deadbeat stocks.” According to Rob Arnott of Research Affiliates: “The focus… Read More