Stock Market Explained for Kids

Your kid hears “the stock market” on TV and thinks it's where rich people go to get richer. Fair assumption. But the stock market is really just a place where people buy and sell tiny pieces of companies. That's it. You can own a sliver of Apple, a crumb of Costco, or a fraction of Nike.

Most stock market articles for kids stop there: “Buy stocks, they go up over time, you'll be rich.” That's half the story. The other half is what can go wrong, and a lot can go wrong.

What is a stock?

A stock is a tiny piece of ownership in a company. If a company is split into 1,000 shares and you buy 1 share, you own 1/1,000th of that business. When the company makes money, your piece becomes more valuable. When the company loses money, your piece shrinks.

Here's the part that matters: you don't control anything. You can't walk into Apple headquarters and tell them to make a better iPhone. You're along for the ride, trusting that the CEO, the board of directors, and thousands of employees will make good decisions with your money.

What can go wrong when you own a stock?

Michael Saylor (the CEO of Strategy, formerly MicroStrategy) has outlined 24 separate risks of owning stocks.¹ Twenty-four. Here are the 6 that are easiest to explain to a kid.

1. Bad leadership (governance risk). The people running a company can make terrible decisions, or worse, steal from it. The board of directors is supposed to protect shareholders, but boards go bad. They overpay themselves, hire their friends, or drive the company off a cliff through sheer incompetence.

2. Technology wipes you out. You could own the world's best horse buggy company in 1905, and then Henry Ford shows up. Kodak invented the digital camera but refused to use it because film was too profitable.² BlackBerry owned the smartphone market in 2009; by 2016, they stopped making phones entirely.³ New technology can vaporize a company's entire business in a few years.

3. A cheaper competitor shows up. You manufacture steel. Someone across the ocean manufactures it cheaper. You're done. This plays out in every industry. The company you own stock in might be great today and priced out tomorrow.

4. Dumb acquisitions destroy value. Companies love buying other companies. Most of those deals fail. AOL merged with Time Warner in 2000 for $164 billion and destroyed roughly $150 to $200 billion in shareholder value over the next few years.⁴ That's not a typo. Hundreds of billions, gone.

5. CEO drama (life cycle risk). Companies depend on the people running them, and people are messy. Disney is the poster child: Frank Wells died in a helicopter crash in 1994, Michael Eisner had open warfare with Jeffrey Katzenberg, Eisner himself had a heart attack, Bob Iger got dragged back at age 72 after Bob Chapek crashed the stock.⁵ Twenty-five years of soap opera at one of the most iconic companies on Earth.

6. Dilution (they just print more stock). When a company fails to manage any of the other risks, their fallback is issuing more shares. That waters down your ownership. You owned 1/1,000th of the company; now you own 1/2,000th. They didn't ask your permission.¹

Real stories of stocks going wrong

Toys “R” Us was the biggest toy store in America. In 2005, private equity firms bought it using $6.6 billion in borrowed money.⁶ The debt crushed the company. They couldn't invest in their stores or compete with Amazon. By 2017, they filed for bankruptcy and closed every U.S. location. The company didn't fail because kids stopped wanting toys.

Saylor himself lived this. During the dot-com crash in 2000, MicroStrategy's stock dropped from $333 to $0.42.⁷ He lost about $6 billion in personal wealth in a single day. The company survived, but anyone who bought at the top lost nearly everything.

These aren't freak accidents. The S&P 500 regularly swaps out failing companies for healthy ones. Of the original 500 companies in the index in 1957, fewer than 60 remain today.⁸ Most companies don't survive long-term. That's the baseline reality of owning individual stocks.

So should you just avoid stocks?

No. But the honest answer is: most people shouldn't pick individual stocks. They should buy an index fund and forget about it.

An index fund owns tiny pieces of hundreds of companies at once. When one company tanks (and some will), the others keep going. The S&P 500 has returned roughly 10% per year on average since 1928, including crashes, wars, and pandemics.⁹ That's a solid track record. Warren Buffett has said that most investors, including professionals, would do better just buying an S&P 500 index fund.¹⁰ Of course, that growth depends on compound interest working in your favor over decades. The longer you hold, the more the math does the work.

The key thing to understand: even index funds still carry all 24 of those risks across the companies inside them. They just spread the damage so no single failure wrecks you.

How Bitcoin is different from stocks

Bitcoin has no CEO. No board of directors. No employees. No one can make a bad acquisition or get into a power struggle with a rival executive. There's no one to embezzle funds, no competitor who can undercut it, and no one who can issue more shares to dilute your ownership.

There will only ever be 21 million bitcoins. That number is locked in the code and can't be changed. Saylor frames it as “absolute scarcity”: “I can create more shares of stock... Bitcoin is absolutely capped.”¹

That doesn't make Bitcoin risk-free. The price swings wildly. Governments could try to regulate it. And it comes with its own tax considerations that parents should understand. But the structural risks that plague stocks (bad management, dilution, failed mergers, CEO drama) simply don't apply. It's a different kind of asset. For a deeper look, read our guide on what Bitcoin actually is.

How to explain the stock market to your kids (parent talking points)

• “What is the stock market?” It's a place where people buy and sell tiny pieces of companies. If you buy a share of Nike, you own a small fraction of Nike. When Nike does well, your piece gets more valuable.
• “Can I lose all my money?” On a single stock, yes. Companies go bankrupt. Toys “R” Us, Kodak, and hundreds of others went to zero. That's why most people spread their money across lots of companies through something called an index fund.
• “Why do some people buy Bitcoin instead?” Because Bitcoin doesn't have a CEO who can mess things up, a board that can make bad deals, or the ability to create more shares. The supply is fixed at 21 million, forever. But Bitcoin's price still moves around a lot, so it's not without risk either.
• “Is the stock market like gambling?” Picking individual stocks can feel like it. Buying a broad index fund is more like owning a small piece of the entire economy. The economy has grown every decade for over a century. That's a better bet than any single company.

Try this at home

The stock detective game (15 minutes, ages 8+). Pick 3 companies your kid knows (Nike, Disney, McDonald's). Look up each stock price together. Then research one thing that went wrong for each company in the past 10 years. Talk about what happened to the stock price when that bad thing hit. Ask: “If you owned shares, would you have sold or held on?”

Materials: A phone or computer to look up stock prices (try Google Finance or Yahoo Finance). Time: 15 minutes.

Sources

1. Saylor, Michael. “Bitcoin vs. Traditional Assets”, discussing the 24 risks of equities and absolute scarcity (2024)
2. Mui, Chunka. “How Kodak Failed,” Forbes (2012)
3. Austen, Ian. “BlackBerry Will Stop Making Its Own Phones,” The New York Times (2016)
4. Arango, Tim. “How the AOL-Time Warner Merger Went So Wrong,” The New York Times (2010)
5. Barnes, Brooks. “Bob Iger Returns to Disney,” The New York Times (2023)
6. Picker, Leslie. “Toys ‘R’ Us to Close All U.S. Stores,” CNBC (2018)
7. Metz, Cade. “MicroStrategy and Michael Saylor's Bitcoin Bet,” The New York Times (2020)
8. Foster, Richard and Kaplan, Sarah. Creative Destruction (2001); updated by Innosight, “Corporate Longevity: S&P 500 Turnover”
9. NYU Stern School of Business, Historical Returns on the S&P 500
10. Buffett, Warren. Berkshire Hathaway 2013 Annual Letter, recommending low-cost S&P 500 index funds