A supply or demand zone is the price area a large order started from. You find it by looking for a tight base followed by a sharp leg-out — consolidation, then one or more big candles leaving in a hurry. The leg-out is the evidence: price left that fast because there was more size resting there than the other side could absorb, and some of it did not get filled. The zone is drawn from the extreme of the base to the open of the leg-out candle. It works best on its first return, degrades with every test, and is invalidated the moment a body closes through it.
Support and resistance tells you where price turned. A supply or demand zone tells you why. That difference changes how you trade it: you are not waiting for a line to hold out of habit, you are waiting for price to come back to unfinished business. It also gives you a clean invalidation. A zone either holds on the return or it does not, and the body close tells you which.
When a large participant wants to buy more than the market can supply at one price, two things happen. The part of the order that can be filled gets filled, and the rest is left unfilled. Price runs away because there was nothing left to sell into the remaining demand.
That run-away move is what you can see. The unfilled remainder is what you are betting on. When price comes back to the area where that order started, the unfilled portion is often still there, and it does the same thing again.
This is a model, not a fact you can verify. You cannot see the order book of a decentralised market. But it produces a testable rule: find the places price left in a hurry from a tight base, mark them, and see whether first returns react. They do, often enough and with a clean enough invalidation to be worth trading. That is the whole justification.
Read it left to right. Price drifts down, then goes quiet — four small candles, barely any range. Then one large candle leaves. The quiet part is the base. The large candle is the leg-out. The band between them is the zone.
Two components, and both are required.
1. The base. A short consolidation — two to six candles with small bodies and overlapping ranges. This is where the order was being worked. A base that runs for thirty candles is not a base, it is a range, and ranges do not produce clean zones because the order pool has had time to fill.
2. The leg-out. One or more candles that leave the base decisively, with bodies several times the size of the base candles. Some traders call it the departure; the plan term is leg-out and this lesson uses it throughout. This is your evidence. No leg-out, no zone. If price drifts out of the consolidation gently, nothing was left behind and there is nothing to come back for.
| Component | What qualifies | What disqualifies |
|---|---|---|
| Base | 2–6 candles, small bodies, tight overlapping range | Long consolidation, wide candles, no clear edge |
| Leg-out | Body 3× or more the average base body, leaves in one direction | Gradual drift, equal-sized candles, immediate return |
| Distance travelled | Price moves well clear of the base before returning | Price stalls 10 pips away and chops |
| Freshness | Price has not returned to the band since | Two or more prior returns |
The strictness is deliberate. A zone that meets all four conditions is rare, and rare is the point. Marking every consolidation on the chart gives you twenty zones a day and no edge at all.
There are two edges and both have a rule.
Drawing it this way gives you a band with a job for each edge. The proximal edge is where you look for a reaction. The distal edge is where your stop goes, because a move beyond the base extreme means the premise was wrong.
Two errors to avoid. Drawing from the wick tip of the leg-out candle makes the zone too wide and your stop meaningless. Drawing a single candle as a zone makes it too narrow and you will be stopped by ordinary noise. Base extreme to leg-out open. Every time.
The structure is identical; only the direction of the leg-out changes.
Demand is a base followed by a rally away. It sits below current price and you are looking to buy the return. Supply is a base followed by a drop away. It sits above current price and you are looking to sell the return.
This gives you a simple sanity check: if price is already inside the zone, the trade has already started without you. A demand zone you are watching from below is not a demand zone any more — price has broken it.
The model has a direct consequence. If the zone works because unfilled orders are resting there, then every time price retests it, some of those orders get filled. The pool shrinks. The zone gets weaker.
A fresh zone has never been revisited since the departure. That is the one to trade. After one test, part of the pool is gone and the reaction is usually smaller. After two, there is often very little left, and the third return is where zones break.
| State | Order pool | How to treat it |
|---|---|---|
| Fresh — 0 touches | Intact | Tradeable. This is the setup. |
| Tested once | Partly consumed | Tradeable with confirmation — wait for a reaction candle. |
| Tested twice | Mostly consumed | Do not initiate. Watch for the break instead. |
| Body closed through | Gone | Invalidated. Mark it as the opposite type. |
This is the main practical difference from support and resistance, where more touches is usually taken as a stronger level. For zones, more touches is weaker. The two ideas look similar on a chart and point in opposite directions, which is exactly why traders who mix them get confused.
They are related but not the same tool, and the differences matter.
| Support & resistance | Supply & demand zone | |
|---|---|---|
| Built from | Repeated reaction at a price | One base plus one leg-out |
| Evidence | Price turned here before | Price left here in a hurry |
| More touches | Generally stronger | Weaker — the pool is consumed |
| Best trade | Third test or the retest after a break | The first retest |
| Invalidation | Body close beyond the band | Body close beyond the base extreme |
In practice the strongest areas are the ones where both agree — a fresh demand zone that also sits on a level price has already respected twice. Confluence between two different kinds of evidence is worth more than three indicators saying the same thing.
The sequence is the same every time.
Everything in that chart follows from the two rules. The entry is the proximal edge because that is where the imbalance began. The stop is below the distal edge because a close beyond the base low means there was no unfilled demand after all. The target is the high the leg-out created, because that is the structure the move built.
Four failure modes, in order of how often they cost money.
1. The zone was never fresh. You found a clean base and departure on the chart, but price had already returned twice before you spotted it. Always scroll right from the leg-out to count the retests before you mark anything.
2. There was no real leg-out. The base is obvious and the move out of it is ordinary. Without an outsized candle there is no evidence that anything was left unfilled, and the band is just a consolidation you have drawn a box around.
3. You traded it against the trend. A demand zone in a clean downtrend will often produce a small bounce and then fail. The zone was real; the context was wrong.
4. You confused a wick with a close. Price spiking through the zone and closing back inside is a test — often the best entry trigger there is. Price closing through it is an invalidation. Same candle shape, opposite meaning, and the difference is only visible once the candle completes.
That chart shows the ordinary end of a zone's life: two tests that hold with progressively weaker reactions, then a third return where the body closes clean through. From that point the band is no longer demand. It is supply, and the next rally into it is a short, not a buy.
If you remember nothing else: a zone is a base plus a leg-out, drawn from the base extreme to the leg-out open, traded on its first retest, and finished the moment a body closes through it.
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