Stocks have delivered higher long-term returns than any other mainstream asset class, averaging about 10% annually before inflation since 1928. That single fact is the core reason to invest in them. But the full case goes deeper: stocks protect your purchasing power against inflation, generate income through dividends, and become remarkably predictable the longer you hold them.
Stocks Outpace Inflation Over Time
Inflation quietly erodes the value of money sitting in a savings account or under a mattress. If prices rise 3% a year, $10,000 today buys only about $7,400 worth of goods a decade from now. Stocks are one of the few assets that have consistently grown faster than inflation over long periods.
The S&P 500, a broad index tracking 500 of the largest U.S. companies, has returned an average of roughly 10% per year since 1928 in nominal terms. After adjusting for inflation, that real return still comes in around 6.8% annually. That means your money doesn’t just keep up with rising prices; it meaningfully outpaces them. A savings account yielding 4% before a period of 3% inflation leaves you with roughly 1% in real growth. Stocks, on average, have delivered nearly seven times that real return over the long run.
Compounding Turns Small Amounts Into Large Ones
Compounding is what happens when your investment earns a return, and then those returns start generating their own returns. In a savings account, this is called compounding interest. In the stock market, it works through a combination of rising share prices and reinvested dividends, and the effect is significantly more powerful over time because the growth rate is higher.
Here’s a practical way to see it. If you invest $6,000 at the beginning of each year and earn an average annual return of 7%, starting at age 23 gives you 42 years of compounding by age 65. Someone who waits until age 28 and makes the same $6,000 annual contributions has only 37 years. Those five extra years of compounding at the front end can produce a six-figure difference in the final balance, even though the total amount of money contributed is only $30,000 more. Time is the most important ingredient, which is why starting early matters more than investing large sums later.
Tax-advantaged accounts like 401(k)s and IRAs amplify this effect. Because earnings in these accounts grow tax-deferred (or tax-free in a Roth account), none of your gains get siphoned off to taxes each year. More money stays invested, and more money compounds.
Dividends Contribute More Than You’d Expect
When people think about stock returns, they usually picture share prices going up. But dividends, the cash payments many companies distribute to shareholders each quarter, have historically been a massive part of total returns. Going back to 1960, reinvested dividends and their compounding account for about 85% of the S&P 500’s cumulative total return, according to Hartford Funds research. On an average annual basis, dividends have contributed roughly 30% of total returns.
This matters for two reasons. First, reinvesting dividends is one of the simplest ways to harness compounding without adding new money. Most brokerage accounts let you automatically reinvest dividends into additional shares. Second, dividends provide a return even during periods when share prices are flat or declining. A stock that pays a 3% dividend yield still puts cash in your pocket while you wait for prices to recover.
Time Dramatically Reduces Risk
The most common objection to stocks is that they’re risky, and over short periods, that’s absolutely true. In a single year, U.S. stocks have returned as much as 54% and lost as much as 43%, based on data going back to 1926. That kind of swing can be stomach-churning if you need the money soon.
But the picture changes dramatically as your holding period lengthens. Over any 10-year stretch since 1926, the worst return for stocks was roughly negative 1%, barely a loss. And over any 20-year period, the worst return was a positive 3.1% per year. No 20-year period in nearly a century of data has produced a loss. The best 20-year stretch returned about 17% annually.
Historically, stocks have beaten cash in 86% of all 10-year holding periods and 100% of all 20-year holding periods since 1926. The longer you stay invested, the more the odds tilt heavily in your favor. This is why stocks are considered a long-term investment: you’re trading short-term unpredictability for a very high probability of solid long-term growth.
The Cost of Staying in Cash
Keeping money in a savings account or money market fund feels safe, and for short-term needs it is. But over longer time horizons, the “safety” of cash comes with an enormous hidden cost: missed growth. Since 1926, stocks have outperformed cash by more than 200 times in cumulative returns. That gap isn’t a rounding error. It’s the difference between building real wealth and simply preserving a slowly shrinking pile of purchasing power.
Even bonds, which are less volatile than stocks, have a harder time keeping pace. Bonds have outperformed cash in about 82% to 90% of 10- to 20-year periods, but they still lag well behind stocks over those same timeframes. Cash and bonds serve important roles for money you’ll need in the next few years or for emergency savings. For money you won’t touch for a decade or more, stocks have historically been the strongest engine for growth.
Staying Invested Matters More Than Timing
One of the biggest risks isn’t the market itself; it’s your own behavior. Investors who try to jump in and out of stocks to avoid downturns often miss the recovery. Missing just the five best days in the market has historically reduced a portfolio’s value by 37% compared to staying fully invested. The best days frequently occur right after the worst days, which means selling during a panic locks in losses and forfeits the rebound.
The practical takeaway is straightforward. Pick a consistent amount to invest on a regular schedule, reinvest your dividends, and resist the urge to react to short-term market swings. The historical evidence overwhelmingly rewards patience over precision. You don’t need to pick the perfect moment to buy. You need to stay in the market long enough for compounding, dividends, and the long-term upward trend of corporate earnings to work in your favor.