What Are the Benefits and Shortfalls of the Herfindahl-Hirschman Index?
The Herfindahl-Hirschman Index (HHI) is a measure of market concentration in an industry. It measures the market ...
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Stock market is more concentrated than ever, raising risks
Note: A higher HHI means ... as a whole a function of how just a few megacap tech stocks are faring. Why it matters: When a few companies dominate the market, that makes passive index investors ...