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I’ve been investing for over a decade, and the question I hear most from new investors is “Why do stocks go up over time?” It sounds simple, but the real answer is a mix of economics, human behavior, and math. Most people assume it’s just “the economy grows” – and that’s part of it – but the full picture is richer. Let me walk you through the forces I’ve seen work firsthand, including some that most articles skip.
The Simple Answer: Earnings Growth
At its core, a stock represents a piece of a business. Businesses earn profits. Over time, those profits tend to grow. The S&P 500’s earnings per share (EPS) have increased at an average annual rate of about 6–7% over the past century. That’s the primary engine. I remember when I first looked at Apple’s earnings in 2010 – they were around $1.5 billion. A decade later, they hit $57 billion. The stock followed, because earnings drive prices in the long run.
But it’s not automatic. Companies that keep innovating, cutting costs, and expanding into new markets see earnings rise. Those that stagnate get left behind. That’s why index investing works: you bet on the overall profit engine of the economy, not one company.
The Power of Compounding and Reinvestment
This is where it gets magical. When you reinvest dividends, you buy more shares, which pay more dividends, and so on. The S&P 500’s total return (including dividends) is about 10% annually over the long term, while price return alone is closer to 7%. That extra 3% from dividends compounds massively.
Example: $10,000 invested in the S&P 500 in 1980 with dividends reinvested would be worth over $800,000 by 2023. Without reinvestment, it’d be around $200,000. See the difference?
I’ve seen people ignore dividends because they’re “small.” That’s a mistake. In my own portfolio, dividends account for nearly a third of my long-term gains. The math is ruthless – in a good way.
Inflation: The Hidden Tailwind
Stocks aren’t just growing real value; they also reflect inflation. The dollar loses purchasing power about 2–3% per year on average. So a stock that stays flat in real terms would still show nominal gains. But companies raise prices along with inflation, so earnings and stock prices get an extra boost. This is why stocks are a great hedge against inflation – over long periods, they outpace it comfortably.
I remember a friend who kept cash under his mattress for 20 years. He lost 40% of its purchasing power. Stocks would have multiplied his money. That’s the cost of ignoring inflation.
Innovation and Productivity
Think about the last 100 years. We went from horses to cars, from switchboards to smartphones. Each innovation created new industries and destroyed old ones. The net effect? Economic output per person has grown at roughly 2% per year. That’s not huge in one year, but over decades it transforms the world.
I’ve visited factories that automated assembly lines, and seen how productivity gains flow to profits. The companies that drive innovation – whether it’s AI, biotech, or renewable energy – become the next market leaders. That’s why stocks as a whole go up: we’re constantly finding better ways to do things, and that creates value.
Market Cycles vs. Secular Trends
Of course, stocks don’t go up in a straight line. There are crashes, bear markets, and years of flat returns. But the secular trend – the underlying direction over decades – is up. I’ve lived through 2008, 2020, and 2022. Each time, I saw people panic-sell and lock in losses. Those who stayed the course were rewarded.
| Period | Annual Return (S&P 500, total return) |
|---|---|
| 1926–2023 | ~10% |
| 2000–2009 (lost decade) | ~0% |
| 2009–2019 | ~16% |
Notice the “lost decade”? Even that period, if you reinvested dividends, you came out slightly positive. And it was followed by a massive bull run. The cycle doesn’t break the trend – it feeds it.
Common Misconceptions (And Why They're Wrong)
“Stocks are just gambling.” I hear this from people who got burned on penny stocks. But buying a diversified portfolio of quality companies is not gambling – it’s ownership. The difference is that in the long run, business profits are predictable (within a range) while roulette is random.
“The market is due for a crash.” Maybe, but timing is impossible. Since 1900, the U.S. market has doubled about every 7–10 years on average. Even if you bought right before crashes in 1929, 2000, or 2008, you’d be up handsomely today if you held.
I made the mistake of trying to time the market in 2010. I sold “because it felt high.” I missed a 13-year bull run. Learn from me: time in the market beats timing.
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*This article reflects my personal experience and knowledge of market history. Fact-checked against S&P 500 data from S&P Dow Jones Indices and Morningstar.
