The Stock Market - How It Works and Why It Moves
Quality reviewed September 2026
- Grades
- Grades 9-12
- Time
- About two 50-minute class periods
- Includes
- 11 ready-to-teach files
- Format
- Word (.docx) · PowerPoint (.pptx)
- Slide deck
- Guided notes
- Guided notes teacher key
- Activity + answer key
- Quiz + answer key
- Exit ticket + answer key
- Teacher guide
- Teacher presentation notes
What students do
- Trace a 25-year market index chart through three separate crashes and recoveries
- Calculate percent change on a stock price move using the new-minus-old formula
- Explain how supply and demand push a price up or down after an earnings report
- Argue why a long-term investor should stay invested through a bear market
What it covers
- How stock exchanges like the NYSE and Nasdaq match buyers and sellers
- Supply and demand as the force that sets every stock price
- Market indexes like the S&P 500 and the Dow as a scoreboard for the whole market
- The difference between a bull market and a bear market, measured in percent change
Learning targets
- Explain how stock exchanges (like the NYSE and Nasdaq) work to match buyers and sellers
- Explain how supply and demand set stock prices and why prices move on news and earnings
- Describe what a market index (like the S&P 500 or the Dow) measures and how bull and bear markets differ
- Use percent change ((new - old) / old) x 100 to size a market move, and explain why a long-term investor stays calm when the market drops
Peek inside
The Whole System
The STOCK MARKET is the whole system of exchanges, buyers, and where shares of public companies are bought and sold.
A share of stock is a small piece of in a public company - the market is where those pieces change hands.
What the Market Does
The market's job is to connect people who want to BUY shares with people who want to SELL them, and agree on a .
The U.S. market trades on (about 9:30 a.m. to 4:00 p.m. Eastern); prices update constantly while it is open.
Why this matters
Every long-term investor eventually watches their account drop, and most people have no real sense of how big or how normal that drop is. This lesson hands students a 25-year index chart with the dot-com bust, the 2008 crash, and the 2020 dip built into the line, then has them calculate each crash's size with the same percent-change formula.
Once students can measure a crash instead of just fearing it, the claim that panic-selling locks in a loss stops being a lecture and becomes their own arithmetic. What changes is what they do the next time an account drops: check the percent change before deciding the sky is falling.
From one teacher to another
I wanted students to see the market's actual shape instead of just hearing "it goes up over time," so this one hands them a 25-year chart with the dot-com bust, 2008, and the 2020 dip built right in. They calculate the size of each crash themselves with the same percent-change formula, which makes the final argument, that panic-selling locks in a loss, land as math instead of a lecture. It's the lesson I most want students to still remember the first time their own account drops.
Every file in this toolkit
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Activity (Student)
A 25-year index chart carries Jordan Reyes from the 2002 dip through 2009's low of about 750 up to 2025, and the same percent-change formula that sizes a single stock's jump from $50 to $58 measures how deep that 2009 crash really was.
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Activity (Answer Key)
A market index climbing from about 1500 in 2000 to 4500 in 2025 still bottoms out three times, a 2009 low of about 750 that works out to a 51.6% drop from its 2007 high of 1550, right beside a single stock's milder jump from $50 to $58, a 16.0% gain.
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Exit Ticket (Student)
What actually sets a stock's price is the first item, then a $50 share falling to $44 after missed earnings becomes a percent change calculation before bull gets told apart from bear. Bear market, time in the market, and recovered need to land in the write.
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Exit Ticket (Answer Key)
Naming the negative 12.0 percent earnings-miss answer and tracing the market's climb from 1500 to 4500 into why staying invested beats selling at the bottom scores full marks on the bear-market rubric.
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Guided Notes (Student)
NYSE and Nasdaq terminology opens the page, then supply and demand, the S&P 500's 500 companies against the Dow's 30, and a percent-change formula turning a $50 stock's jump to $58 into 16 percent.
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Guided Notes (Teacher Key)
Exchange definitions come first, from the older companies on the NYSE to the fully electronic Nasdaq, before confirming the plus-16-percent jump and how a bull market differs from a bear.
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Quiz (Student)
Telling an exchange from an index is one of several questions, along with sizing a $50-to-$58 jump as a percent change and explaining why a 25-year climb from 1500 to 4500 matters for a long-term investor.
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Quiz (Answer Key)
Exchanges matching buyers to sellers and the S&P 500 tracking 500 companies come out correct, while the +16.0 percent answer on that $50-to-$58 stock jump finishes the set.
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Slides
The NYSE and Nasdaq match buyers and sellers on one slide, then supply and demand push a stock price up or down before the percent-change formula turns a $50 share rising to $58 into a plus-16 percent move, closing on bull markets against bear ones.
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Teacher Guide
A 25-year market index climbs from 1500 to 4500 despite three separate crashes, including a 51.6% drop in 2008, the case for staying invested this 56-point guide teaches. Extensions track a real index for a week, name a historical bear market, and calculate an earnings-day percent change.
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Teacher Presentation Notes
Twenty-five years of a broad market index climbing from 1500 to 4500, up 200%, despite crashing in 2002, 2009, and 2020, is the chart that closes out coverage of how the NYSE and Nasdaq match buyers and sellers.
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