May 1, 2026

What 401(k) Investors Can Learn From Long-Term Market History

Why understanding past market cycles may help long-term savers stay focused

For many Americans, a 401(k) plan is the foundation of their retirement savings. But when markets get rocky, it’s easy to lose perspective. Sudden drops, dramatic news stories, and economic uncertainty can make people feel anxious and tempted to make quick decisions based on emotion instead of a long-term plan.

Looking back at market history reminds us that ups and downs are a normal part of investing. Although markets go through corrections and bear markets, those who stay disciplined and focused on the long term have usually seen their investments grow over time.

The real challenge for retirement savers isn’t avoiding market swings altogether. It’s learning what those ups and downs have looked like in the past—and establishing expectations that match the realities of long-term investing.

Over long periods, U.S. stocks have historically produced average annual returns near 10%, although actual yearly results vary widely. Fidelity notes that the S&P 500’s average 30-year annualized return through the end of 2025 was approximately 10.4%, close to its long-term average.

But those returns almost never happen in a perfectly smooth way.

Some years the market surges more than 20%, while other years see big drops. If you only look at the short-term, you might not realize just how normal these ups and downs are.

Historical market data shows that temporary declines are normal features of long-term investing. The market has experienced multiple corrections of 10% or more throughout modern history, including during the dot-com crash, the Global Financial Crisis of 2008, the COVID-19 selloff in 2020, and numerous shorter downturns in between.

For people saving for retirement, it’s especially helpful to keep this long-term perspective in mind.

Someone adding to a 401(k) for 25 or 30 years will almost certainly go through several bear markets. That doesn’t mean their plan is broken—it’s just how markets behave over time.

One important lesson from market history is the value of time.

People close to retirement usually need a more balanced portfolio to reduce big swings in value. Younger investors, on the other hand, often have decades before they’ll need their savings. Having more time on your side means there’s a better chance to recover from declines and benefit from future growth.

That’s why target-date retirement funds are so popular in 401(k) plans. These funds automatically get more conservative as you get closer to retirement, shifting your investments to match your changing needs.

Diversifying your investments is also key to long-term retirement success.

The Securities and Exchange Commission says diversification helps reduce the risks that come with putting all your eggs in one basket—like investing in just one company, sector, or asset type.

For most people saving in a 401(k), diversification might look like a mix of:

U.S. large-cap stocks
International equities
Bonds
Target-date funds
Stable value or cash equivalents

Different types of investments react differently during tough economic times. Diversification can’t prevent losses, but it can help make your investment path less bumpy over the long run.

Market history also teaches us about how investor actions affects outcomes.

Some of the strongest market comebacks have happened right after big declines. If you pull your money out during a downturn, you might miss the rebound. Kiplinger points out that permitting emotions drive your investment decisions—or trying to time the market—often hurts long-term returns.

This is especially important for retirement plans, since your regular payroll contributions often keep going in market downturns.

When the market drops, your ongoing contributions buy more shares at lower prices. Over time, this strategy—called dollar-cost averaging—can help you build more wealth.

History also shows how important it is to have realistic expectations.

Some people expect the market to deliver double-digit returns year after year. Others get discouraged by short-term losses and fear things will never improve. Neither view matches what’s actually happened in the past.

Most retirement experts suggest expecting long-term 401(k) returns in the ballpark of 5% to 8% a year for a diversified portfolio, depending on your mix of investments and overall market conditions.

Remember, those averages include both big bull markets and tough downturns.

For example:

The S&P 500 gained more than 20% in several recent years.
The market also took major hits in 2008 and early 2020.
People who stayed invested through those tough periods historically took part in the rebounds that followed.

Fees are another area where experience teaches an important lesson.

Even small differences in fees can add up to big differences in your retirement savings over decades. Kiplinger reports that high fees can really shrink your long-term retirement balance.

That’s why many people look at things like:

Expense ratios
Fund diversification
Long-term consistency
Asset allocation alignment
Risk tolerance

instead of just looking at how an investment did recently.

The big takeaway from long-term market history is simple: successful retirement investing is less about guessing what the market will do next, and more about building good habits and sticking with them.

That means things like:

Continuing regular contributions
Sustaining suitable diversification
Rebalancing periodically
Managing risk appropriately
Eschewing emotional investment decisions

No historical pattern guarantees future results. Markets can experience prolonged stretches of uncertainty, and investors should always consider their own financial goals, timeline, and risk capacity.

Still, history shows that people who stay patient and stick with their plan during tough times often end up in a stronger position to reach their retirement goals.

For many 401(k) savers, realizing that market ups and downs are normal—not unusual—can help turn scary drops into reminders to stay focused on the long-term journey.

Sources

Disclosure

This article is for informational and educational purposes only and should not be considered investment, tax, or legal advice. Past performance does not guarantee future results. Investing involves risk, including the possible loss of principal. Asset allocation and diversification do not ensure a profit or protect against loss in declining markets. Individuals should consult with a certified financial advisor, tax professional, or legal advisor regarding their specific situation before making financial decisions. Advisory services are offered through a Registered Investment Advisor (RIA).

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What 401(k) Investors Can Learn From Long-Term Market History

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