Alphametry Blog Are mid-caps the future of discretionary investing?

According to chief economist Erik Weisman, PhD, and research analyst Sean Cameron, CFA, of MFS Investment Management, 175 securities contributed to half of the net results in 1975. In 2015, this figure had fallen to just 30 companies. They explain that economic activity has become more concentrated among fewer companies. The winners in today's markets are larger, older, and less dynamic than their competitors.