I just noticed that many people still don’t really understand “demand and supply,” even though this factor is very important for predicting the prices of all kinds of assets—whether stocks, energy, gold, or even digital assets.

Let’s first understand what the key variables that determine demand and supply are.

**Demand** is the desire to buy goods at different price levels, while **Supply** is the desire to sell. These two are inversely related: when the price increases, demand decreases, but supply increases. This happens because of two factors: the **Income Effect** (when prices are low, your money is worth more) and the **Substitution Effect** (you compare it with other goods).

The variables that affect demand are not just price. There is also income, preferences, the number of consumers, expectations of future prices, and even unexpected events—such as the Iran-Israel war—which cause oil demand to surge suddenly.

As for the variables that affect supply, besides price, they also include production costs, technology, the number of competitors, tax policies, climate conditions, and access to funding sources. These factors lead sellers to decide how much to sell at what price.

When demand and supply converge at the **Equilibrium** point, the price and quantity will stabilize. If the price is too high, there will be excess inventory; if the price is too low, there will be shortages. In both situations, prices will eventually be pushed back toward equilibrium.

In financial markets, this principle still applies. When stock prices rise, it shows that buying pressure (demand) is winning; when prices fall, it shows that selling pressure (supply) is winning. The factors that determine demand in financial markets include interest rates, liquidity in the system, and investor sentiment. Supply is affected by company policies, capital increases through IPOs, and regulations.

A technique traders use is the **Demand Supply Zone**, where they look for moments when price falls out of balance. For example, **DBR (Drop Base Rally)** is caused by excess supply: the price drops, then pauses and consolidates in a range. When buying pressure returns, the price breaks upward—this becomes an entry point. The opposite, **RBD (Rally Base Drop)**, is caused by excess demand: the price rallies upward, then pauses. When selling pressure wins, the price plunges downward.

Most importantly, the key variables that determine demand and supply are not just numbers; they are the psychology of market participants—their beliefs, expectations, and external factors. If you can understand this, you can read the market better and make smarter investment decisions.