How Stock Prices Move
Stock prices change constantly during trading hours. Understanding what drives these movements is fundamental to investing.
At its core, stock prices are determined by one simple principle: supply and demand. More buyers than sellers? Price goes up. More sellers than buyers? Price goes down.
Supply and Demand
Every stock price is the result of buyers and sellers agreeing on a value.
- More buyers → Price rises (demand exceeds supply)
- More sellers → Price falls (supply exceeds demand)
- Balanced → Price stays stable
This happens thousands of times per second for popular stocks during market hours.
What Influences Demand?
Several factors make people want to buy or sell a stock:
Company Performance
| Factor | Effect on Price |
|---|---|
| Strong earnings | Price typically rises |
| Missed expectations | Price typically falls |
| New product launch | Can go either way |
| Management change | Depends on who's coming/going |
Market Sentiment
The overall mood of investors affects all stocks:
- Bull market – Optimism drives prices up
- Bear market – Fear drives prices down
"Be fearful when others are greedy, and greedy when others are fearful." – Warren Buffett
Economic Factors
Broader economic conditions play a role:
- Interest rates – Higher rates can reduce stock attractiveness
- Inflation – Erodes purchasing power
- GDP growth – Strong economy supports stock prices
- Currency movements – Affects export-oriented companies
News and Events
- Political changes – Elections, policy shifts
- Global events – Wars, pandemics, trade agreements
- Sector-specific news – Regulations affecting an industry
Price Discovery
The process of finding a stock's "fair" price happens continuously through trading.
Imagine a stock trading at ₹100:
- A buyer offers ₹101 → They're willing to pay more
- A seller asks for ₹99 → They're willing to accept less
- Trades happen, price adjusts to reflect this activity
There is no single "correct" price. The market price is simply what the last buyer and seller agreed upon.
Circuit Breakers
To prevent excessive volatility, exchanges have circuit limits:
| Circuit Level | Action |
|---|---|
| Stock hits upper circuit | Trading halted (no more buyers at that price) |
| Stock hits lower circuit | Trading halted (no more sellers at that price) |
| Index falls 10% | Market-wide trading halt |
These protect investors from panic selling and irrational buying.
Why Prices Surprise Us
Even with analysis, stock prices often behave unexpectedly because:
- Markets are forward-looking – Prices reflect expectations, not just current facts
- Information asymmetry – Some traders have more information
- Psychological biases – Fear and greed distort rational thinking
- Random events – Unexpected news can change everything instantly
Key Takeaways
- Stock prices are driven by supply and demand
- Company performance, market sentiment, and economics all play roles
- There's no "correct" price – only what buyers and sellers agree on
- Circuit breakers protect against extreme volatility
You've completed the first module! Next, let's learn how to actually start investing.
Sources & Disclaimer
- SEBI Investor Education Guidelines (investor.sebi.gov.in)
- NSE Pathshala - Financial Literacy Program
Note: Any benchmarks (e.g., "Good ROE is > 20%", or specific P/E ranges) are simplified industry heuristics for educational purposes. True evaluation depends on specific industry context, market cycles, and individual company circumstances.