Are index funds safe?

Are index funds safe, or are they a bubble waiting to burst?

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Index funds are often touted as being suitable for most investors. It’s easy to see the appeal of them. Hard-earned savings can be eaten away by extortionate fees of active fund managers. The usually low lump sum and monthly contribution amounts appeal to those who wish to start small and save a percentage of their regular income. And passive investors can set up a monthly direct debit and then forget about their savings until retirement. Or can they?

Warren Buffett believes in index trackers, as do many of my fellow Fool’s. However, of late, numerous people have been warning about the dangers of investing in them. I wanted to examine this side of the argument.

Michael Burry, the famed investor from The Big Short, has concerns about passive funds. In Bloomberg, he likened index investing to the subprime CDOs that were instrumental in causing the 2008 financial crisis.

According to Burry, the similarities are caused because the price setting is not being done by “fundamental security-level analysis”. His worry is that passive investors are buying each company at a fixed ratio, rather than considering the actual value of the company in the underlying index.

Although I think index investing – or holding passive funds as part of an investment portfolio – could be a great strategy, I do share some of Burry’s concerns.

The main obstacle for me is – what happens if the markets go into free-fall?

The next bubble?

I question the temperament of a passive fund-holder. An investor with their money held totally in index funds could see their wealth drop by a huge margin. They would lack the benefit of an active fund or self-managed equities, which might enable them to shift assets to other territories or classes.

What would the average passive investor do in that situation? Hold and watch the price fall further, or sell and realise their losses? I think in this situation, a market sell-off could occur. Perhaps, then, we are in the bubble that Burry describes.

Of course, no one can predict what will happen in the market going forward. But in this situation, if the bubble pops, I think the true cool-headed passive investor who continues to buy at these low price points, might be rubbing their hands together.

Spiral?

I think that the problem of passive investors rushing to the door, and causing a downward spiral, could only arise if index funds owned the majority of the market. An estimate in 2017 put the global figure of shares owned by index funds at 18%.

Index funds have their place in the market, just as actively managed funds and personal investors who pick their investments do. Ultimately, though, if an investor can set aside time to learn about investing and keep up to date with the market news, and avoid picking a few losing stocks in the index, their returns should exceed the respective market index.

T Sligo has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Black woman using smartphone at home, watching stock charts.
Investing Articles

2 spectacular growth stocks to consider buying in March

Investors ignore the risks with growth stocks when things are going well. But when this changes, fixating on the dangers…

Read more »

UK financial background: share prices and stock graph overlaid on an image of the Union Jack
Investing Articles

Why is the FTSE 100 suddenly beating the S&P 500?

The UK's blue-chip index has been on fire over the past couple of years, helping it catch up to the…

Read more »

Artillery rocket system aimed to the sky and soldiers at sunset.
Investing Articles

This non-oil FTSE stock’s risen 4.6% in 3 days. What’s going on?

Against the backdrop of trouble in the Middle East, James Beard investigates why this FTSE 100 stock’s doing so well.…

Read more »

Three signposts pointing in different directions, with 'Buy' 'Sell' and 'Hold' on
Investing Articles

Has a 2026 stock market crash just come a whole lot closer?

If we're in for a stock market crash, what's the best way for us to prepare, and what kinds of…

Read more »

Silhouette of a bull standing on top of a landscape with the sun setting behind it
Investing Articles

Up 79% in a year, this FTSE 250 stock still gets a resounding Strong Buy from analysts

This under-the-radar growth stock in the FTSE 250 has been on fire over the past 12 months. Why are City…

Read more »

Frustrated young white male looking disconsolate while sat on his sofa holding a beer
Investing Articles

Vistry shares down 20%! Here’s what I’m doing…

Vistry shares have crashed as the firm cuts prices and moves away from share buybacks. But is Stephen Wright’s long-term…

Read more »

UK financial background: share prices and stock graph overlaid on an image of the Union Jack
Investing Articles

The IAG share price is climbing today despite war fears – what’s going on?

It's been a tough week for the IAG share price and Harvey Jones expects more volatility. Yet the FTSE 100…

Read more »

Businessman with tablet, waiting at the train station platform
Investing Articles

By March 2027, £1,000 invested in Natwest shares could turn into…

NatWest shares have been on a tear in recent years. What might the next 12 months have in store for…

Read more »