I just gained a better understanding of this through studying supply and demand. It’s much simpler than I thought. If you grasp this basic principle, you’ll see stock and asset prices in a different way.

Supply is the willingness of sellers to sell, while demand is the willingness of buyers to buy. These two sides are constantly competing. When one side has more strength, the price will move in that direction. If buyers are stronger, prices go up; if sellers are stronger, prices go down. That’s how it works.

Think of it this way: the price at any moment is determined by the balance between the two sides. The point where both have equal strength is called equilibrium—that’s the price the market accepts. If the price rises above equilibrium, sellers can’t resist selling, leading to excess supply, and the price will fall back down. Conversely, if the price drops too low, buyers see an opportunity and come in, causing shortages, and the price bounces back up.

Factors affecting demand include investor confidence, interest rate policies, or even political news. On the supply side, factors include production costs, company policies, or new technologies that might change the quantity of goods in the market.

A clear real-world example is the situation in the Strait of Hormuz. As tensions increased, the supply of crude oil dropped by more than 20% of the global supply. Meanwhile, energy demand remained steady. The result was a rapid spike in oil prices. This is a clear supply shock.

When trading stocks, this concept is very useful. If stock prices rally quickly and then pause and trade within a range (a base), it indicates demand is slowing and selling pressure is emerging. When the price breaks above that range, demand wins again, and prices continue higher. We call this a Rally Base Rally (RBR).

Conversely, if prices drop sharply and then pause within a range (a base), it shows selling pressure is easing and buying is coming in. When the price breaks below that range, supply becomes stronger, and prices fall further. This is called Drop Base Drop (DBD).

The key to remember is that supply and demand are not just theories in textbooks—they happen in real markets every day, every hour. Understanding this helps you see price movements differently and improves your timing in buying and selling. The importance of understanding this is that it allows us not to rely solely on price action signals but to understand why prices move the way they do.