Actually, if you’ve ever wondered why stock prices or all kinds of assets rise and fall the way they do, the answer is simpler than you think. It all comes down to supply and demand—most naturally, that is how it works.

Whether it’s stocks, energy, gold, or even digital assets, this principle works in the same way. When more people want to buy than want to sell, the price goes up. Conversely, when fewer people want to buy, the price goes down. It’s that simple.

But the importance goes even further. If you truly understand supply and demand, you’ll understand how the market works—and more importantly, you’ll know when to buy or sell.

Let’s start with the basics. Demand is the desire to buy. It’s the number of people standing in line waiting to purchase that asset at different price levels. When the price drops, demand increases because it’s cheaper. On the contrary, when the price rises, fewer people are willing to buy.

Why is that? There are two reasons. First, when the price falls, your money becomes more valuable, leaving you with more cash to buy other assets. Second, when the price of this asset drops, it looks cheaper compared with similar assets—so people switch and buy this one instead.

Supply is the opposite. It’s the number of people who want to sell. When the price rises, sellers are more willing to sell because they get more money. When the price drops, sellers are less eager to sell because it feels like a pity to sell at a lower price.

Now, where does the market happen? It happens at the point where supply and demand meet. This is the equilibrium point, where the price tends to stabilize. If the price tries to rise too much, more sellers will come in, leaving excess supply—so the price falls back. If the price drops too far, more buyers will show up, and the asset becomes scarce—so the price rises again.

But in real financial markets, it’s much more complex than that, because there are many factors that affect supply and demand—not just price alone.

On the demand side: when the economy is doing well, people have more money and are more willing to invest. When interest rates are low, bank deposits are less attractive, so people shift to buying stocks or other risky assets. And when there’s plenty of liquidity in the system, buying demand increases. A very important factor is also confidence—when people believe the market will improve, they’re more willing to enter and buy.

On the supply side: companies may decide to issue more shares or buy back shares, which affects the number of shares available in the market. New companies may come to market via IPO, increasing supply. Government policies or regulations also impact the ability to sell securities.

Now there are unexpected events that come in beyond expectations—for example, a war in the Middle East. The Strait of Hormuz closes. Normally, 20 percent of the world’s oil passes through this point. When it shuts down, supply drops sharply, while energy demand remains the same. Oil prices therefore surge naturally. This is a supply shock.

So how does all of this help us with investing?

If you’re a fundamental analyst, you’ll see that a stock’s price rising or falling is due to the buying and selling of the business—not the stock itself. If the business is expected to grow well, buyers will be happy to buy at higher prices, while sellers will delay selling, pushing prices up. Conversely, if the business is expected to decline, buyers will hold back on buying, and sellers will rush to sell, pushing prices down.

If you’re a technical analyst, you’ll focus on buying pressure and selling pressure, using various tools.

Candlestick charts are the simplest. A green candlestick means buyers win—the closing price is higher than the opening price. That indicates strong buying pressure. A red candlestick means sellers win—the closing price is lower than the opening price, showing strong selling pressure. A doji represents a standoff where neither side wins; the price may go nowhere.

The trend (trend) tells the same story. If the price keeps making new highs, demand still has strength. If the price keeps making new lows, supply still has strength.

Support and resistance are points where demand or supply is waiting. Support is where people want to buy. Resistance is where people want to sell.

A popular technique is the Demand Supply Zone, which looks for moments when demand or supply is out of balance, causing price to move quickly—then it comes to a point where the price pauses within a range before continuing on or switching direction.

There are many patterns, such as Demand Zone Drop Base Rally (DBR): price crashes sharply, then consolidates in a range. When good news arrives, price rallies further. Conversely, Supply Zone Rally Base Drop (RBD) is when price surges sharply, then consolidates; when bad news comes, price continues to drop.

Or sometimes the trend keeps going: Demand Zone Rally Base Rally (RBR), where price rallies, consolidates, and then rallies again. Or Supply Zone Drop Base Drop (DBD), where price drops, consolidates, and then continues dropping.

The key is that understanding supply and demand isn’t hard, but you do have to practice by watching real prices a lot. With enough experience, you’ll be able to see the bigger picture clearly. The market isn’t as mysterious as it seems—it’s simply a game between buyers and sellers. That’s all.