Home / Course / Module 1 / Supply, Demand and Price
Module 1 · Lesson 6 of 6Supply and demand is the most basic idea in economics, and it sits underneath every price chart. This lesson shows how it works in markets and why it is more nuanced than it first looks.
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Demand is how much of something buyers want at each possible price. Supply is how much sellers are willing to offer at each price. Usually, as price rises, buyers want less and sellers offer more.
The price where the amount buyers want equals the amount sellers offer is the equilibrium price. At that price, the market clears: there is no surplus left over and no shortage.
Hypothetical example. Imagine a market for a rare coin, with these numbers.
| Price | Buyers want | Sellers offer | Result |
|---|---|---|---|
| £80 | 120 coins | 40 coins | Shortage of 80, price pushed up |
| £100 | 90 coins | 90 coins | Balanced, equilibrium |
| £120 | 50 coins | 130 coins | Surplus of 80, price pushed down |
At £80 there are more eager buyers than coins, so buyers compete and the price rises. At £120 sellers are stuck with unsold coins, so they cut prices. The market settles around £100.
It is crucial to separate two things: a move along a curve (price changes, quantity changes) and a shift of the whole curve (something else changes). Common drivers of shifts include:
For gold, supply comes from mining and recycled gold, while demand comes from jewellery, technology, investors and central banks. Supply changes slowly because new mines take years, so demand shifts often drive shorter-term moves. The deeper detail is in What Moves Gold Prices.
In financial markets, prices reflect what people expect as well as what is happening now. If traders believe a central bank will raise rates next month, they may buy or sell today, long before the decision. By the time the news is announced, much of it may already be in the price.
This is why a result that looks good can still cause a price to fall: it simply was not as good as hoped. It is also why price can be hard to predict from headlines alone.
Markets are forward-looking. A price already includes the crowd's expectations, so it moves most on surprises, the gap between what happened and what was expected.
Chart traders often talk about support and resistance. Support is a price area where buyers have stepped in before, which can slow or stop a fall. Resistance is an area where sellers have appeared, which can slow or stop a rise. These are everyday expressions of supply and demand: more buyers than sellers at one level, more sellers than buyers at another.
A trend upward means demand has been outweighing supply for a while. A sideways range means the two are roughly in balance. Charts are a record of that tug of war. For how to read them, see How to Read Gold Charts.
| Chart picture | Supply and demand reading |
|---|---|
| Strong rise with few pauses | Demand outweighing supply |
| Strong fall | Supply outweighing demand |
| Sideways range | Rough balance |
| Price bounces at a level | Buyers or sellers defended it before |
These readings are descriptions of what happened, not forecasts. A level that held before can fail next time.
Supply and demand is a simplified model. Real markets include speculation, leverage, panic and herd behaviour, so prices can overshoot, staying far from what basic fundamentals suggest for long periods. Another limit is that for currencies and financial assets, supply is not fixed in the same way as a harvest.
Practical points for traders:
You now have the foundation for this module. Continue to the later parts of the course to see how derivatives and CFDs let you take positions on price moves, and always remember that leveraged trading can lose money quickly. Revisit What Is a Financial Market? if any terms feel unfamiliar.
Explaining a move after it has happened is much easier than predicting the next one. Treat supply and demand as a way of understanding markets, not a method that guarantees any outcome.
A common error is treating supply and demand as a prediction tool. It explains why a price moved far more easily than it forecasts the next move. Another is assuming that every chart level will hold because it did before. A third is forgetting that the other side of the trade exists: if you are buying because you think a price is too low, someone sensible is selling because they think it is high enough. Ask what they might know or want that you do not, and keep position sizes small enough that being wrong is survivable.
It is a useful starting point, but speculation, leverage and sentiment also matter, so it never explains everything.
No. A price can keep falling for good reasons, and it can stay low for a long time. A lower price is not proof of value.
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