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TLDR

Passive investing (ETFs/index funds) has grown from 20% in 2012 to 55% in 2025. It’s cheap and easy but dangerous: it inflates weak “zombie” companies, concentrates money in a few mega-firms, and makes markets move in sync. This creates bubbles and systemic risk. When it unwinds, it could trigger a severe crash. Diversification and some active investing are needed to avoid disaster.

In the age of AI -there is going to be more disruption than we haver ever seen and I maintain 60% of the S&P500 is going to be made redundant by 2030 and drastically underperform.

The Details

Think of the stock market as a party. Back in 2012, only about 20% of people were just copying the dance moves ("passive investing" through index funds and ETFs). Now in 2025, more than half (55%) are doing it. It’s cheap and easy, but it creates big risks.

Why it’s risky:

  • Fake Prices: Passive money just buys whatever’s in the index. This props up weak “zombie” companies and inflates stars like Apple, even if they don’t deserve it. Prices stop reflecting real value, making bubbles more likely.

  • Too Much in Too Few Stocks: Passive funds pour money into mega-companies, crowding out smaller ones. When panic hits, everyone sells the same stocks at once → wild crashes.

  • Everything Moves Together: Because passive funds hold the same baskets, whole markets rise and fall in sync. A small problem can spread quickly, triggering a big meltdown.

This cycle feeds itself: more passive investing → more distortions → more danger → which ironically pushes even more people into passive funds. Eventually, when the “music stops,” weak companies will collapse and markets could crash hard, hurting everyday investors. Experts warn it’s not if, but when. The advice: don’t rely only on passive funds—mix in active strategies or diversify.

In addition, if you are in passive funds, you will never beat dollar debasement IMHO

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Comments

robbymay

When weak companies die, the ones that are successful will replace them. Historically, its been a great choice

Rhododendro

It's always dangerous when everybody is doing the same dance. Lame party.

iroc007

NFA: IF YOU HAD AN INDEX FUND WOULD YOU LIQUIDATE IT, PAY THE TAXES, AND BUY A BTC ETF, TSLA, SOL ETF, AND REAL ESTATE INSTEAD? OR JUST KEEP IT AS A HEDGE AGAINST BAD SINGLE ASSET PICKING?

KMB

I never realised the negative impact of index funds. Thanks for highlighting the issue!

Pater Familias

Clear brakedown, so precious! I couldn't get a friend off Etf's yesterday at the caffè. So sad to see!

W

Currently rotating young daughters Passive index Funds into SOL,TSLA,BTC. Thanks for the advices. They don't make it easy to withdraw money on behalf of a child thats for sure.

tincan

Index investing is connected to employ paid pensions. Zombie investments Make BLS mighty again and hoping boomers to cash out slowly

Paul O

This is a tough one. I have a lot of friends working in the trades and stuff like that. They don’t have the time to sit down and learn the markets and understanding all the investing strategies that are open to them, so I usually give basic suggestions to them all you would need to do is go to a fund and you could see what their investing in the primary investment of these funds, the things that are carrying all the weight are a specific seven stocks just go diversify yourself into those top stocks, and Nvidia, Tesla, Microsoft Meta, and you will outperform the Fund. The reality is for the average person. The easiest thing to do is go to an index fund. If they can just get out of the index and go directly into the thing that drives the Fund they’d be doing a lot better and actually some of my friends did that and see the results.

InvestAnswers

i get you.... i know so many also... and they never listen... BTC TSLA since 2017.... i keep telling them and they say the same thing... I will wait for price to come down again

EverythingSalad

do you have stats on how much money is tied up in 401k, and percentage of it is invested in S&P500 index funds?

David

There are different types of ETF's. Most of them aren't blindly choosing stocks. There is a strong correlation between market cap and performance. That said. Yes there is a risk.