Index funds have wrecked the market and caused a bubble
6 responses | 1 like
Started by metmike - June 25, 2026, 9:15 p.m.

AI Overview

 Index funds are criticized for "wrecking" the market because they distort traditional stock pricing. By automatically funneling money into the largest, highest-performing companies regardless of fundamental value, passive investing fuels dangerous market concentration, stifles healthy competition, and creates self-fulfilling asset bubbles. [1, 2, 3, 4]The massive shift toward passive index tracking has introduced several fundamental issues to the stock market:
  • Distorted Price Discovery: Index funds buy baskets of stocks blindly according to market capitalization or index rules, rather than analyzing a company's underlying earnings or growth. Critics argue this breaks the market's core function of pricing assets accurately. [1, 2]
  • Extreme Market Concentration: Because index funds allocate the highest percentage of capital to the biggest companies (like the "Magnificent Seven"), they artificially inflate the prices of these specific giants. This creates a loop: their prices rise, their weight in the index increases, and funds are forced to buy more of them, detaching their valuation from reality. [1, 2]
  • Reduced Market Diversity: With so much capital passively tracking indices, there are fewer active investors performing deep research to discover true value. This lack of dissenting opinions can lead to major market bubbles that are vulnerable to sharp, sudden corrections. [1, 2, 3, 4]
  • Oligopoly Power: Passive funds are dominated by a few massive asset managers (like Vanguard, BlackRock, and State Street). These managers have gained unprecedented voting power over major corporations, potentially reducing market competition or pushing corporate strategies that do not align with long-term profitability. [1, 2]

+++++++++++++++++++++++++++++++++++++

Previous thread

                VERY bad time to invest in the stock market!!            

                             Started by metmike - June 18, 2026, 2:56 p.m.   

         https://www.marketforum.com/forum/topic/120945/

Comments
By metmike - June 25, 2026, 9:25 p.m.
Like Reply

Measuring the Costs of Index Reconstitution: A Global Perspective

https://www.dimensional.com/us-en/insights/measuring-the-costs-of-index-reconstitution-a-global-perspective


KEY TAKEAWAYS

 
Index-tracking funds seek to match an index’s performance, which may lead to constraints and implementation costs that hurt returns. 

We find that demanding immediacy during reconstitution events leads to costs for a broad range of funds that track indices around the world. 


A better approach would provide the flexibility to spread turnover across all trading days, avoiding the costs of demanding immediacy and allowing for a consistent focus on stocks with higher expected returns.    

The appeal of low expense ratios and broad diversification has contributed to the growth of index funds. Yet those appealing qualities can come at a cost. Index funds primarily seek to match the performance of an index. This objective may lead to constraints and implementation costs that are not reflected in the funds’ expense ratios.

By metmike - June 25, 2026, 9:43 p.m.
Like Reply

Index Funds have disrupted price discovery!

https://www.youtube.com/shorts/av-AI21ToRc

By metmike - June 25, 2026, 10:02 p.m.
Like Reply

The Coming Problem with Index Funds

https://www.lynalden.com/index-funds/

By metmike - June 25, 2026, 10:12 p.m.
Like Reply

The Looming Index Fund Bubble: Protecting Yourself with Rule #1 Investing

https://www.ruleoneinvesting.com/blog/investing-news-and-tips/the-looming-index-fund-bubble/

Valuations Detached from Reality

Here's the uncomfortable truth: stock prices are increasingly disconnected from business performance. A great way to see this is by looking at the Shiller PE ratio, a Nobel Prize-winning measure of market valuation.

Historically, the S&P 500 trades at around 17 times earnings. In 2025, the Shiller PE was at 38—more than double the long-term average. As of the end of January 2026, it had just gone above 40. Put another way, investors today are essentially waiting more than 38 years to get their money back from S&P 500 earnings.

Meanwhile, the market's earnings yield—the equivalent of an interest rate on stocks—is just 2.6%. Compare that with a 4.5% yield on U.S. Treasury bonds, and you can see the disconnect. Why would anyone accept less return for far more risk?

This reminds me of the late 1990s, when companies like Yahoo traded at sky-high valuations totally disconnected from reality. Back then, the bubble eventually burst. And bubbles don't deflate quietly—they pop.


By patrick - June 26, 2026, 8:57 a.m.
Like Reply

Heh.
This has been pretty clear for a long time. The SPCX manipulation takes it to a France 1788 level.

By metmike - June 26, 2026, 12:19 p.m.
Like Reply

Thanks, patrick,

Actually I have you to thank for this new thread.

In the conversation on the other one, I got that from reading your comments and did more investigating to better understand where you are coming from ..........and learned a ton.

And decided this is worth its own thread because it's MUCH worse than I thought I knew. 

The other thread was to especially warn people about what will likely happen to the stock market during a Donald Trump impeachment. 

This index fund situation has obviously been happening for many years and is independent of Donald Trump's impact, even if he is intentionally feeding it right now.

It's always a wonderful day when we learn something new and I appreciate you making yesterday so wonderful for me!