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Imagine you run a lemonade stand in the park and it's such a hit that you want to build a whole lemonade factory, but the factory costs $1,000 and you only have 50. So, you cut your company into 100 equal slices called shares. You sell each one for $10. Selling shares to the public for the first time is called an IPO.
That stands for initial public offering. Each shareholder now owns a tiny piece of your company. They may get a slice of its profits called a dividend, but that's not guaranteed. Sell all 100 shares and the factory fund is full. Here's the part most people miss. Once those shares are sold, the company's big sale is over.
Now shareholders can buy and sell those shares with each other. The company gets none of that money. They meet at a stock exchange like the New York Stock Exchange or the all electronic NASDAQ. A buyer offers a price called the bid. A seller names a price called the ask. When the bid and the ask meet at the same price, a trade happens.
So who decides the price of a share? Nobody and everybody. If more people want to buy than want to sell, buyers compete and the price climbs. If more people want to sell, sellers compete and the price slides. It works a lot like an auction. But why would people suddenly want to buy or sell? Because a share's price is really a guess about how much the company will earn in the future.
Good news, like a hot summer, makes people expect bigger profits, so buyers rush in. Bad news, like a lemon shortage, makes people expect less, so sellers rush out. When the whole market falls, the news usually touches many companies at once. Think of rising interest rates, fears of a recession, or a big shock somewhere in the world.
Nobody can predict tomorrow's news. For today's reasons, check a trusted news source. With thousands of companies, how can anyone say what the market did today? They use an index. It's an average of many companies share prices. Here's a tiny index of five madeup shops by the park. When the lemonade bar falls, but the others rise, the index can still go up.
The Dow follows 30 big American companies. The S&P 500 follows 500 of the largest. So what happens over many years? Big crashes happen. After 1929, the Dow lost 89%. It took about 25 years to climb back. Around 2008, the S&P 500 fell 57%. In early 2020, it fell about 30%, then recovered that same year.
Big company stocks have lost money in about one year out of every three. Yet over long stretches like 15 years or more, stocks have generally grown. But there's never a guarantee. That's why many people spread their money across lots of different companies. It's called diversification. Some decades were great and one lost money.
So the stock market is people trading tiny slices of real companies and every price is everyone's best guess about the future.
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