The invention of market cap-weighted indices has been beneficial for the average investor by providing a simple and efficient way to gain exposure to equity markets. We examine how elevated ...

It has become widely accepted that the U.S. economy is plagued by rising and excessive industrial concentration. In recent years, this view has become increasingly influential in policy discussions ...

Silk, Alvin J., and Charles King III. "Concentration Levels in the U.S. Advertising and Marketing Services Industry: Myth vs. Reality." Harvard Business School ...

Goldman Sachs has issued a stark warning for U.S. equity investors, predicting significantly lower returns for the S&P 500 over the next decade due to historically high levels of market concentration.

The following chart from Avantis shows that concentration levels have increased dramatically in recent years, while the levels for the smaller-cap and value indexes have been relatively stable. Note ...