Supply and Demand Zones: Good Intuition, Rough Measurement

Supply and demand zones are areas price previously left sharply. The assumption is that unfilled orders remain there and the market will react again on a return. The intuition is sound, but the zone is drawn from the shape of candles, without knowing whether orders were actually there.

What it is

The typical definition: a consolidation (base) before a strong move. A demand zone is a base before a rise, a supply zone a base before a fall. The faster price left and the fewer times it has returned, the “fresher” and stronger the zone is supposed to be.

The approach is close to the idea of support and resistance, only with the emphasis on areas rather than lines.

How people use it

entries on the first return to the zone
judging how “fresh” a zone is
combining zones from many timeframes

What the research and evidence say

There's no independent research on how well zones drawn from candles work. The idea that limit orders cluster in certain areas is supported by microstructure research. The question is whether the shape of candles points to those areas well.

Weaknesses

subjective zone boundaries
a large number of zones across many timeframes
no information on whether the orders are still waiting
an “invalidated” zone often gets redrawn

What order flow shows

The order book shows whether limit orders are sitting at the level today, and the footprint shows whether anyone is executing against them when price returns to the zone. A zone on the chart is a hypothesis, and order flow lets you test it at the moment price comes back to it.

Indicators vs order flow

Every indicator and every pattern in this section is built from the same data: a candle's open, high, low, close and sometimes volume. They're derivatives of price, showing the effect rather than the cause. Order flow looks at what price is made of: who was buying and selling aggressively (delta), where limit orders were waiting (the order book) and at which prices the market accepted trade (the volume profile).

On CME futures this data is real and comes from one central market. Spot forex doesn't have it: platforms show tick volume, the number of price changes at a single provider.

To be fair: order flow isn't the Holy Grail. It takes learning, it can be noisy, big players hide some of their orders, and an edge only comes from a process and risk control. But it gives you information that simply isn't on a candlestick chart.

How to use it sensibly

draw zones according to fixed rules
on a return, check whether there's real liquidity and a reaction
record the zones that didn't work

Glossary: Support and resistance
Glossary: DOM (order book)
Glossary: Absorption
Glossary: Liquidity
Atlas of biases: Cherry-picking
Atlas of biases: Belief perseverance
Order flow: Absorption on a real market: 51,300
Also under the microscope: Elliott Waves
Also under the microscope: Harmonic patterns
Also under the microscope: Dow Theory

Frequently asked questions

How do you draw supply and demand zones?

Usually as a consolidation area before a strong move up (demand) or down (supply). The boundaries are subjective.

How are zones different from support and resistance?

Mainly in that you mark areas instead of lines and emphasise how sharply price left.

Educational content, not investment advice. No signals, entries, stops or position sizes.