Is market concentration in a few large stocks unusual historically?
Core argument: The "Magnificent 7" — Alphabet, Amazon, Apple, Meta, Microsoft, Nvidia, and Tesla — account for nearly 30% of the total value of the S&P 500, a concentration the author calls exceptional.
The hype around the “Magnificent 7” stocks [Alphabet, Amazon, Apple, Meta, Microsoft, Nvidia, and Tesla] that have driven the stock market this year is reminiscent of the dot.com era, which ended with a spectacular crash. However, there are two reasons why today’s developments seem less worrying: The rise of hyped stocks was more extreme in the Dot.com era, as was the rise of the rest of the market. While today’s situation is exceptional, with seven stocks accounting for nearly 30% of the total value of the S&P 500, the rule in the past has been that only a few stocks generated most of the value creation of the stock market in the US and internationally.

