Is a Stock Market Crash Coming? What History Actually Tells Us

Is a stock market crash coming? Nobody knows, not us, not any fund manager, and not any headline promising to call the top. But there is something more useful than a prediction: valuation. This guide shows what the Shiller CAPE ratio says about today's market compared with 100 years of history, and what that does and does not mean for investors.

In this guide: What history shows · What it does and doesn't mean · Why "when" is the wrong question · Anti-fragility explained · FAQ

What does history show about stock market valuations?

The Shiller CAPE ratio (cyclically adjusted price-to-earnings) smooths out ten years of inflation-adjusted earnings. It shows what investors are paying for the market right now, relative to its own long-term history.

That does not mean a crash is imminent. Valuations can stay stretched for years. What it does mean is that anyone investing today without understanding where valuations sit is taking on more risk than they realise.

Does a high CAPE ratio mean the market will crash?

No. A high CAPE ratio has historically been associated with weaker average returns over the following decade, not with a specific crash date. Expensive markets can keep climbing, and cheap markets can keep falling. Valuation tells you about the odds over the long run, not about next month.

That is why we treat valuation as a risk gauge rather than a trading signal. It helps you understand what you stand to lose, which is the first thing most investors skip. If you want the deeper reasoning on why markets revert over time, read our guide to mean reversion.

Why "when will the market crash" is the wrong question

Trying to predict the exact timing of a crash is a losing game. Even professional forecasters get it wrong more often than right, which we break down in why market predictions fail investors. It is also why the old line about timing the market versus time in the market misses the point: the price you start at matters.

The more useful question is not "when will it happen". It is "is my portfolio built to handle it whenever it does".

What is an anti-fragile portfolio?

Anti-fragility is the idea that some things get stronger from stress, not weaker. Applied to investing, there are three ways a portfolio can respond to a shock.

How TMM approaches market risk

Our approach starts with one rule: don't lose money. That does not mean chasing the highest possible return. It means understanding what you stand to lose and building around that first. We explain the order of thinking in the risk hierarchy and how not to lose money.

It is the same valuation-aware thinking behind our CAPE tracking, our Buffett Indicator work, and our weekly Signals & Noise coverage. If you want it in your inbox each week, you can join the free Signals & Noise newsletter.

Frequently asked questions

What is the Shiller CAPE ratio?

The Shiller CAPE ratio compares a market's price to its average inflation-adjusted earnings over the past ten years. Smoothing earnings over a decade removes much of the noise from short-term booms and slumps, which makes it a useful gauge of how expensive a market is relative to its own history.

Does a high CAPE ratio mean a crash is coming?

Not directly. A high CAPE ratio indicates stretched valuations relative to history, which has historically been associated with weaker forward returns over the following decade, not a specific crash date.

When was the stock market last this expensive?

On the CAPE measure, the only other periods with comparable valuations were the late 1920s and the year 2000. Each is a reminder of how stretched valuations can become, and how long they can stay that way before reverting.

How is an anti-fragile portfolio different from a diversified one?

Diversification spreads risk across assets. Anti-fragility goes a step further, structuring a portfolio so that volatility and disorder can work in its favour, not just be absorbed by it.

Should I sell everything if valuations are high?

This isn't personal advice, and TMM doesn't tell anyone what to buy, sell, or hold. Our content is general education only. Always speak with a licensed adviser about your specific situation.

Keep reading

• Why Market Predictions Fail Investors
• Timing the Market or Time in the Market?
• Mean Reversion
• The Risk Hierarchy
• Bubble Times

This newsletter is for informational purposes only and does not constitute financial advice. Total Money Management | AFSL 568642.