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How the Stock Market Actually Works

The Stock Market for Beginners • Beginner Investing • 6 min

What this lesson is about

Behind the numbers scrolling across a screen is a genuinely simple mechanism: a marketplace where buyers and sellers meet, and price is whatever they agree on.

2 parts · a quick check after each · then the quiz

Part 1 of 2

Strip away the tickers and flashing red-and-green numbers. A stock exchange is pretty simple. It's a marketplace. People who want to buy shares meet those who want to sell shares. A price gets set when their offers match. Every buyer makes a "bid". The price they're ready to pay. Every seller has an "ask," the price they’ll take. When a bid and an ask meet at the same number, a trade happens instantly. That trade price then becomes the stock's new quoted price.

This all takes place electronically now, and it happens fast. Major U.S. exchanges like the New York Stock Exchange (NYSE) and the Nasdaq handle millions of these bid/ask matches every trading day. That’s why a stock's price can change constantly. Sometimes it shifts many times per second as new information and orders reshape the balance between buyers and sellers.

Reading a stock chartThe average is the trend with the noise taken out, nothing more.

Quick check

At its core, what is a stock exchange like the NYSE or Nasdaq?

Part 2 of 2

Insider Angle: The NYSE has a long history. It dates back to 1792 when 24 New York stockbrokers signed the Buttonwood Agreement under a buttonwood tree on what’s now Wall Street. They agreed on basic rules for trading securities. Nasdaq, founded in 1971, took a different route. Instead of a physical trading floor with shouting orders, it was the world’s first electronic stock exchange. Nasdaq matched buyers and sellers using a computerized quotation system. This electronic-first model is how all major exchanges work today, including the NYSE, which has largely moved on from its old floor-trading image.
Try This: Look up the current bid and ask price for any stock you’re curious about. Most free stock-quote sites show both. Calculate the spread between them. Notice if it's a large or small gap relative to the stock's price.

Quick check

What ultimately determines the price at which a stock trades at any given moment?

Quiz

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