In my last stock market post, I explained how people can buy pieces of companies and how businesses can raise money by issuing shares. But that left me with another question: if a stock represents part of a company, who decides what that piece is worth?
The answer is the market.
A stock doesn’t have one permanent price. It can change throughout the day as people buy and sell. The highest price a buyer is currently willing to pay is called the “bid,” while the lowest price a seller is willing to accept is the “ask.” When a buyer and seller agree on a price, a trade happens. The next trade might happen at a different price.
This is basically supply and demand, which I talked about in an earlier economics post.
Imagine a sneaker company releases a new shoe and reports much higher sales than expected. Investors might believe the business will make more money in the future and become willing to pay more for its stock. That increased demand can push the price up.
Now imagine sales are falling or a competitor releases a better product. Investors might become less confident and decide to sell. If sellers have to accept lower offers to find willing buyers, the price falls
But here’s where the stock market gets interesting. A stock’s price isn’t only based on how well a company is doing right now. It also reflects what investors think will happen next.
Imagine a company makes $1 billion in profit this year. That sounds impressive, but what if investors expected $1.5 billion? Its stock price could fall even though the business is still making money. The results were good, just not as good as investors expected.
The opposite can happen too. A company might earn very little today, but investors could believe it has a huge opportunity to grow. That belief may make them willing to pay more for its stock.
To form those expectations, investors look at revenue, profits, products, competition, management, and growth potential. They also consider the broader economy, including consumer spending and interest rates.
One number investors sometimes use is the price-to-earnings, or P/E, ratio. It compares a company’s stock price with its earnings per share, which is its profit divided by its number of shares. Using earnings from the past year, it shows how much investors are paying for each dollar of those annual earnings.
For example, imagine two companies each earned $5 per share over the past year. If one’s stock costs $50, its P/E ratio is 10. If the other’s costs $100, its P/E ratio is 20. Investors are paying $10 for each dollar of the first company’s annual earnings and $20 for each dollar of the second’s. That doesn’t automatically make either company a better investment. Investors still need to consider things like growth and risk. The ratio is one piece of the picture, not a complete answer.
Interest rates matter too. The Federal Reserve explains that changes in its policy rate influence borrowing costs, spending, and business investment.
Think back to the sneaker company. If borrowing becomes more expensive, it might delay building a new factory because the loan would cost more. If borrowing becomes cheaper, expansion might become more affordable. Customers might also spend less when borrowing costs rise, which could affect shoe sales. Investors can consider those changes when deciding what they’re willing to pay.
But a stock’s trading price isn’t necessarily what every investor thinks it’s worth. People can look at the same business and reach different conclusions. Even companies with similar sales can be valued differently because their costs, growth prospects, and risks differ. There isn’t one obvious “correct” value everyone can agree on. A market price tells us what shares are trading for, not whether every buyer is making a good decision.
And expectations can be wrong. A promising product can fail, customers can switch to competitors, or the economy can weaken. Buying a stock means accepting the possibility of losing money, not just the opportunity to make it.
This is why investing isn’t simply about finding a good company. It’s also about deciding whether the price makes sense compared with the company’s performance and future potential.
Looking at the stock market this way, I think the question becomes more interesting. It isn’t just “Is this a good business?” It’s also “How much is it reasonable to pay for a piece of it?” Understanding that doesn’t make the future predictable, but it makes the numbers on the screen feel a lot less mysterious.
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