What Affects Prices: Supply, Demand, and News
The Price Discovery Process
Every price movement in every market comes down to one thing: a shift in the balance between buyers and sellers. When more participants want to buy than sell, prices rise. When more want to sell than buy, prices fall. Everything else — news, data, tweets, earnings — matters only because it changes this balance.
Supply and Demand
Demand is how much of something people want to buy at various price levels. Supply is how much people are willing to sell. The equilibrium — where supply meets demand — determines the market price.
When something disrupts this balance, prices move:
- A drought damages wheat crops → supply decreases → wheat prices rise
- A tech company reports record earnings → demand for its stock increases → stock price rises
- A central bank raises interest rates → demand for the currency increases → exchange rate rises
Economic Data Releases
Certain scheduled data releases cause significant market volatility. The most important include:
- Non-Farm Payrolls (NFP) — US jobs report, released first Friday of each month. Often the most volatile day of the month for futures and forex.
- Consumer Price Index (CPI) — measures inflation. Critical because it influences central bank decisions.
- Federal Reserve (FOMC) decisions — interest rate changes and policy statements. Can move markets hundreds of points in seconds.
- GDP (Gross Domestic Product) — the broadest measure of economic health.
- Retail Sales — consumer spending data.
Pro tip: Use an economic calendar (like PropTally's built-in calendar) to know exactly when these releases are scheduled. Never be surprised by a news event.
News and Geopolitical Events
Beyond scheduled data, unexpected news can move markets dramatically:
- War and conflict — drives safe-haven buying (gold, US dollar, bonds)
- Natural disasters — can impact commodity prices and regional economies
- Political events — elections, policy changes, trade wars
- Corporate news — mergers, earnings surprises, CEO departures
- Central bank surprises — emergency rate decisions or unexpected policy shifts
Market Sentiment
Sentiment is the overall mood of market participants. It's the reason markets sometimes seem to overreact or underreact to news. Two key emotional drivers:
- Fear: When traders are fearful, they sell aggressively. Markets can fall faster than they rise because fear is a more powerful emotion than greed.
- Greed: When traders are greedy, they buy aggressively and ignore risks. This creates bubbles and overextended moves.
The VIX (Volatility Index) is often called the "fear gauge" — it rises when stock market fear increases.
How Traders Use This Information
There are two broad approaches:
- Fundamental traders analyze economic data, news, and macroeconomic conditions to predict longer-term price direction.
- Technical traders focus on chart patterns and price action, arguing that all information is already reflected in the price.
Most successful traders combine both: they use fundamentals to establish a directional bias and technicals to time their entries and exits. Understanding what moves prices helps you avoid being on the wrong side of a major event.
핵심 요점
- Prices move because of changes in supply and demand dynamics
- Economic data releases (NFP, CPI, FOMC) cause some of the biggest market moves
- Market sentiment and trader psychology amplify price moves beyond fundamentals
- Learning to anticipate market-moving events gives you a trading edge