Stock market history teaches us things that are frequently difficult and surprising. The S&P 500 had annualised returns of -0.95% between 2000 and 2009, which is when the “lost decade” began. If you think that can’t happen again, think again.
The current state of the market actually resembles previous peaks quite a bit. The Shiller CAPE ratio went over 40 for the second time in history in September 2025. The first time was in December 1999. The S&P 500 dropped 37% in the next two years after the CAPE went over 40. Current forecasts, on the other hand, say that yearly returns will only be 0.4% before inflation.
This essay talks about what really happens once bull markets end and why the prices of stocks today are distressing. You’ll learn about the three main factors that affect stock market returns, how big market cycles have behaved in the past, and how to prepare your portfolio to be ready for what might be a tough decade ahead.
The three main things that affect stock market returns
Knowing what makes the stock market go up and down might help you set realistic goals for your portfolio. When you look at what makes the market work, three things always come up as the main reasons for stock returns.
Dividend yield: the part that makes money
Dividends are the money that firms give to their shareholders from their profits. Dividends represent the income component of your overall investment returns. In the past, this consistent stream of revenue has been significant for total returns. Dividends have added around 4% to the average annual return in the S&P 500 since 1930, along with the 6.08% growth from share price gain.
The dividend yield, which is found by dividing the annual payouts per share by the current stock price, is an important source of income that can help keep a portfolio stable. During market downturns, dividends serve as a financial buffer, compensating for price losses. Furthermore, since 1960, 85% of the S&P 500’s total gain has come from compounding dividends.
But dividend yields change depending on how the market is doing. As of December 2025, S&P 500 trackers only give a 1% yield, whereas European markets usually give a higher yield of about 2.75%.
Earnings growth is what drives the business
The main thing that makes stocks go up over time is earnings growth. Investing in stocks is basically buying a piece of a company’s future profits. Legendary investor Sam Stovall says, “If I buy a stock, how do I make money?” You make money when the company generates profits.
There is a clear correlation between earnings and stock prices: a 10% increase in earnings should result in a corresponding 10% increase in the share price. This link is why price-to-earnings ratios are still such excellent ways to value stocks.
When we look at market data, we can see that prices and earnings move together closely over long periods of time. Earnings may drop temporarily during economic downturns, but stock prices usually don’t drop as much. This fact is because stocks show a company’s long-term earnings potential, not just its current performance.
Changes in valuation: how the market feels
The third thing that affects returns is valuation change, which is how much investors are ready to pay for each dollar of earnings. This aspect shows how the market feels and can greatly increase or decrease returns, no matter how well the business is doing.
Price-to-earnings ratios and other valuation metrics can help you figure out if stocks are trading above or below historical averages. When investors are feeling positive, valuations often go beyond what they have been in the past. On the other hand, when investors are feeling awful, valuations go down.
Changes in valuations have recently caused almost two-thirds of the market’s 22% total return over a 12-month period. However, this pattern usually reverses over longer periods of time. In general, valuation is not a reliable predictor of short-term performance, but it becomes more important over longer investment horizons.
The combination of these three factors—dividend yield, earnings growth, and valuation changes—ultimately decides how much money you make on your investments. Knowing what they are helps you figure out whether the current market conditions are favourable for future growth or if they might lead to disappointment.
What the stock market has taught us following bull runs
When you look at how the market has changed over time, it gives investors a dismal picture of the present. Bull runs from the past always hit turning points, which are generally followed by protracted periods of poor returns.
The IT bubble of the 2000s and the subsequent lost decade illustrate the market’s tendency to become overly optimistic
The dot-com bubble is an example of how the market can get too excited and forget about the real world. Between 1995 and March 2000, investments in the Nasdaq Composite skyrocketed by 600% as investors poured money into internet startups regardless of whether they were making cash. Companies focused on market share instead of building sustainable business models, and the “growth over profits” mentality took over.
This speculative frenzy reached its climax on March 10, 2000, when the Nasdaq hit 5,048.62. What happened next was terrible: the index dropped 78% by October 2002. Even established IT companies suffered greatly, with Cisco losing 80% of its market value.
The aftermath created what investors now call the “Lost Decade”. Although markets started to recover after the dot-com crash, they didn’t get back to where they were before the 2007–09 financial crisis. An investment made in August 2000, for instance, would have decreased from €95.42 to €50.34 during the first crash. Seven years later, when it was almost back to normal (€90.89), the housing bubble burst, and values dropped to €43.89.
The market experienced a rebound after 2008, followed by a prolonged period of slow recovery
The Great Recession made things even worse for the market, which was already struggling because of the tech boom. In the end, the market fell by a shocking 54% over the course of 12 years, making it the second-worst loss in 150 years of market history.
The recovery took a long time. It wasn’t until May 2013, more than 12 years after the first dot-com disaster, that the markets got back to their prior highs. This extended recovery period shows how long it can take to resolve problems that happen during a bull market.
Data shows that only about 15% of the economies that had banking crises in 2007–2008 had recovered to their pre-crisis growth rate ten years later. By 2017, capital investment was still about 25% lower than it had been before the crisis, which is one reason why the recovery was so slow.
Data has revealed patterns spanning over 150 years
The larger market’s history shows that after long bull runs, the same trends always occur:
- Recovery is likely, but the time it takes varies: The S&P 500 has gone up 75% of the time in the year after market bottoms, with average gains of 17% over the next 12 months. However, recovery speeds are completely unique—the 1929 crash took 25 years to reach previous highs, while the COVID-19 crash only took eight months.
- New highs don’t always mean trouble: Contrary to popular belief, new market highs aren’t always bad news. Between 2013 and 2021, during strong bull markets, the S&P 500 closed at new all-time highs an average of 38 days a year, or about 15% of trading days.
- Long-term growth continues even after crashes: One euro invested in 1871 would have risen to €32,588.18 by August 2025 after adjusting for inflation. This shows how important it is to keep a long-term view even when things are volatile in the near term.
Market history shows that patient investors usually do better by staying invested than by trying to time their exits and entries. For example, waiting for even small 3% pullbacks has historically led to missing 2.3% gains, which is why disciplined commitment is often better than market-timing strategies.
What makes current valuations suspicious?
Current market valuation measurements show worrying similarities to past bubble eras. Several reliable indications warn that investors should be careful in today’s market, especially when valuations are at all-time highs.
How to Understand the Shiller CAPE Ratio
Economist Robert Shiller created the Cyclically Adjusted Price-to-Earnings (CAPE) ratio, which provides a more detailed picture of market valuation than traditional metrics. The CAPE adjusts for inflation and uses average earnings over ten years to smooth out economic changes. This long-term view helps you figure out if stocks are fairly priced or too expensive.
The CAPE ratio has averaged around 16–17 over the years. As of 2025, it is about 35.49, which is more than double its historical average. This high reading puts the current market in a rarefied state. In fact, the CAPE ratio has only been above 30 three times before: in 1929, 1999, and 2007. In each of these instances, a significant market drop followed.
This indicator was excellent at predicting what would happen after the tech bubble burst in the late 1990s. In 1997, when the ratio hit 28, Shiller said that market values would be 40% lower in ten years. This prediction came true during the 2008 financial crisis, when the S&P 500 dropped 60%.
We can compare the current market with that of 1999
The similarities between today’s market and the dot-com bubble era are obvious. According to recent studies, the market’s overvaluation ranges from 119% to 197%, depending on the chosen metric. The result is a huge difference—more than three standard deviations above historical means—that could mean trouble ahead.
Total market capitalisation, relative to GDP, which Warren Buffett says is the best way to value a company, has reached an all-time high of 217%. This is much higher than the previous highs during the dot-com bubble and the pandemic-era rally of 2021. Buffett himself warned, “If the ratio approaches 200%—as it did in 1999 and part of 2000—you are putting yourself at risk.”
The “Magnificent Seven” tech heavyweights also have a forward P/E of 38x, which is higher than the average of 30x for tech leaders during the dot-com bubble. This concentration of value in a few companies is similar to how the market was structured before prior crashes.
The PEG ratio and what it means now
The Price/Earnings-to-Growth (PEG) ratio is another useful tool for valuing stocks since it takes into account growth forecasts. It is calculated by dividing a company’s P/E ratio by its predicted growth rate, which provides you more information than just the P/E ratio.
A PEG ratio below 1.0 usually means that a stock is undervalued compared to its growth prospects, while a PEG ratio above 1.0 means that it might be overvalued. According to famous investor Peter Lynch, a company’s P/E and expected growth should be equal in a fairly valued market, which supports a PEG ratio of 1.0.
Looking at historical S&P 500 PEG data shows that chances to buy when the market’s PEG drops below 1.0 are very rare. This only happened a few times in the 1980s and even fewer times in the 2000s and 2010s. Currently, high PEG ratios across major indices suggest that returns will be limited in the next decade.
What reasonable return expectations look like
To set realistic investment goals, you need to look beyond the often-cited 10% historical stock market average. Most investors don’t know that this number hides significant differences in actual returns from decade to decade.
A look at historical averages compared to current estimates
The S&P 500’s long-term average annual return from 1926 to 2023 was about 12.2%. But major banks expect much lower returns over the next ten years. Vanguard expects U.S. stocks to return only 3.5% to 5.5% a year, while Goldman Sachs expects a slightly better 7.7%. Bank of America’s equity strategists, on the other hand, expect the S&P 500 to lose 0.1% over the next decade, which is a big change from what has happened in the past.
The calculations for expected returns range from 0.4% to 9%
The Gordon formula shows why today’s high valuations limit future returns. The formula says that stock returns are equal to the adjusted dividend yield plus the growth rate of stock prices. With adjusted dividend yields around 2.5–3.0% and projected GDP growth of 1.5%, the formula says returns will be around 4.0–4.5%, which is much lower than historical averages.
The S&P 500 would need an adjusted dividend yield of about 5.5%, which is twice what it is now, to go back to its historical 7% return. This means that either stock prices need to drop considerably or investors need to be okay with lower returns in the future.
Why high P/E ratios make it difficult to make money in the future
Recent studies have shown that high P/E ratios mostly predict lower future returns, not higher future earnings growth. In fact, variations in future returns account for around 75% of the differences in P/E ratios between stocks, whereas differences in future earnings growth account for only 25%.
This pattern holds true in a wide range of market conditions and over a wide range of time periods. The S&P 500 is currently trading at a P/E ratio of about 27, which is well above its 5-year average range of 19.5 to 25.4. This trend means that the math behind valuations and returns suggests that investors should be careful for the next ten years.
Clever investors prepare for the next ten years by using tried-and-true strategies
To prepare your portfolio for lower returns, employ proven strategies. Instead of chasing previous success, think about how to set up your assets so they can handle different market circumstances over the next 10 years.
Spread your investments out among different areas and types of assets
Diversifying your investments well means more than just owning many stocks. According to research from Goldman Sachs, the best portfolio right now is about 50% US stocks and 50% gold. Adding assets from emerging markets can also help lower your US dollar risk, since these investments usually have a negative correlation with the US dollar. To make your portfolio even more stable, think about adding bonds, alternatives, and selective liquid alternatives, which tend to have better Sharpe ratios during times of crisis.
To keep risk in check, rebalance often
Annual rebalancing is the best way to keep your investments from being too reactive (monthly) or too passive (every two years). Your original asset allocation will change as your investments’ value changes, which could increase your risk. For example, if your target is 70% stocks and 30% bonds, but the market moves them to 76% stocks and 24% bonds, it’s time to go back to your target allocation. Many advisors suggest setting specific thresholds (like ±3-5% deviation) to trigger rebalancing.
Make conservative guesses about returns
Using historical averages (12.2% for the S&P 500) to plan your finances often leads to plans that are too optimistic. These assumptions only give your plan a 50% chance of success. Instead, use Monte Carlo simulations to test your plan against a wide range of market scenarios and make more conservative estimates—maybe 2–3% below historical averages. This will give you a more realistic picture of how ready you are for retirement.
Don’t put too much money into areas that are too expensive
The S&P 500 is currently trading at about 30 times earnings, which is one of the highest levels ever, not during a recession. The “Magnificent Seven” tech giants now have a collective forward P/E of 38x, which is even higher than the average during the dot-com bubble. To lower this risk, think about using low-volatility investment strategies that naturally keep you away from overvalued, hype-driven sectors and towards more fairly valued, stable companies.
Final Thoughts
When stock markets reach very high values, history tends to repeat itself. Many investors ignore current warning signs because they think “this time will be different,” but the fundamentals of the market have stayed the same for hundreds of years. After every long bull run, valuations always go back to their historical averages.
Looking back at past market cycles makes it clear that too much optimism usually comes before disappointing returns. The CAPE ratio going over 40 is a sign of possible trouble ahead, just like it was before the terrible dot-com crash. Other valuation metrics also show that today’s market is between 119% and 197% above fair value, which is where big corrections usually happen.
Because of this, your investment strategy needs to take into account that returns will be much lower than the widely reported 10% historical average. Major financial institutions expect U.S. equities to only return 3.5% to 5.5% per year over the next ten years. Some even say that returns will be negative during this period. This is because of simple math: high valuations today limit tomorrow’s gains.
To be smart about preparing for this tough market, you need to take a few specific steps. First, invest in more than just the concentrated U.S. market; look for regions and asset classes with better valuations. Second, make sure to rebalance your portfolio on a regular basis, ideally once a year, to keep risk under control. Third, use conservative return assumptions instead of optimistic historical averages when making financial plans. Finally, cut back on your exposure to sectors that are overly valued, like the tech-heavy “Magnificent Seven”.
The stock market will eventually reward investors who are patient, disciplined, and understand market cycles. It’s almost impossible to time exact market peaks, but knowing when valuations are extreme can help you set realistic expectations. Long-term investors who keep their perspective during inevitable downturns are likely to do well, even if they face short-term problems. Market history shows us that the best way to build wealth is not to chase the last stages of bull runs but to position yourself wisely throughout full market cycles.
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