How Stocks Are Priced: Supply, Demand, and Value
Stock prices emerge from the interaction of buy and sell orders, anchored by estimates of fair value.
How Stocks Are Priced: Supply, Demand, and Value
A stock's price is the price at which the last buyer and seller agreed to trade. It changes constantly because the balance between buyers and sellers shifts every second. Underneath that short-term movement sits a longer-term anchor: the company's underlying value.
Price: The Short-Term Story
In the market, price is set by supply and demand:
- More buyers than sellers → price rises
- More sellers than buyers → price falls
- Equal pressure → price holds
The exchange's order book shows this live: every bid and ask is a real order waiting to fill.
Factors that move prices minute-to-minute:
- Earnings releases
- News and analyst upgrades/downgrades
- Macro data (inflation, jobs, interest rates)
- Sentiment and order flow
Value: The Long-Term Story
A company's fair value is what the business is worth based on future cash flows. Analysts estimate it with valuation models:
| Method | What It Compares |
|---|---|
| P/E ratio | Price per share vs. earnings per share |
| DCF | Discounted future cash flows |
| PEG ratio | P/E adjusted for growth |
| P/B ratio | Price vs. book value of assets |
| Dividend discount | Present value of future dividends |
Price can drift far from value for long stretches, but eventually the two reconnect — either the price falls toward value, or the business grows into its price.
Price vs. Value
- Price is what you pay — visible, real-time, set by the crowd
- Value is what you get — estimated, slower-moving, set by fundamentals
Warren Buffett's teacher Benjamin Graham put it simply: "In the short run, the market is a voting machine; in the long run, it is a weighing machine."
Practical Takeaways
- Don't assume a high price means a company is expensive — check valuation ratios
- Don't assume a falling price means cheap — the business may be deteriorating
- Compare price to value over time, not in a single snapshot
Understanding the gap between price and value is one of the most important edges a beginner can develop. Charts tell you what the crowd is doing today; fundamentals tell you what the business is actually worth.