Why do stock markets move? If you've ever wondered how quickly stock or asset prices can go up and down, the answer isn't as complicated as you might think. It's simply a balance between those who want to buy and those who want to sell. That is the core of demand and supply that drives everything in the financial markets.

I've noticed that many people see the demand and supply graph as something too complex, but in reality, it's just two sides fighting each other. One side wants to buy, the other wants to sell. When buyers outnumber sellers, prices go up. When sellers outnumber buyers, prices go down.

Let's look at demand first. That's the desire to buy. If the price of a product drops, people want to buy more. If the price rises, people buy less. There are two reasons for this: when prices fall, the money in your pocket becomes more valuable (income effect), and this product appears cheaper compared to similar products (substitution effect). Both make people want to buy more.

As for supply, that's the desire to sell. Sellers want to sell when prices are high and prefer not to sell when prices are low. This is opposite to demand. Sellers are happy when prices are high because they get more money. Therefore, they offer more products.

Now, imagine the demand and supply lines intersecting. That point is the equilibrium, where price and quantity are balanced. If the price tries to rise above this point, sellers are willing to sell more, but buyers will buy less, leaving excess supply, which pushes the price back down. If the price tries to fall below this point, buyers want to buy more, but sellers want to sell less, causing shortages, which pushes the price back up. It's a self-correcting balance.

Why is this important for investing? Because if you understand demand and supply, you can predict where prices might go. For example, good news about a company increases demand, which raises the price. Conversely, bad news decreases demand, causing prices to fall.

In real markets, other factors also influence demand and supply, such as interest rates, investor confidence, economic conditions, or unexpected events like wars or crises. For instance, when the Strait of Hormuz was closed during the Iran war, about 20% of the world's oil supply disappeared from the market, drastically reducing supply. Demand remained, so oil prices surged sharply. This is a clear example of a supply shock.

In actual trading, traders and investors use demand and supply charts in many ways. Some look at price action through candlestick charts. If a candlestick is green (closes higher than it opens), it indicates buyers won. If it's red (closes lower than it opens), it shows sellers won. Others analyze trends—if prices keep making new highs, demand is strong; if they keep making new lows, supply is strong.

A popular technique is identifying support and resistance levels—points where demand and supply are waiting. Support is a price level where buyers are ready to buy; resistance is where sellers are ready to sell. When prices reach support, they often bounce back up; when they hit resistance, they tend to reverse downward.

There's also a method called Demand Supply Zone, which might seem complex but is really about finding moments when the price loses balance and will find a new equilibrium. When prices drop sharply and then bounce back, that's a Demand Zone. When prices rise, form a base, then fall again, that's a Supply Zone. Traders enter and exit at these points.

But remember, demand and supply are not the only factors deciding prices. They work alongside other influences like news, economic data, company policies, or market psychology. When many people are afraid, prices fall; when confidence is high, prices rise.

In summary, demand and supply are a game between buyers and sellers. If you understand this game, you'll better understand the markets—whether it's stocks, oil, gold, or digital assets. Learning this takes time, practice, and analyzing many real demand and supply charts. But once you grasp it, it becomes a powerful tool for your investment decisions.