What is the law of supply and demand?
The law of supply and demand is the first of the three laws underpinning the Wyckoff Method: when demand exceeds supply, price rises; when supply exceeds demand, price falls; when the two are roughly in balance, price moves sideways. Richard Wyckoff treated this not as a slogan but as the causal engine behind every bar on the chart, and his entire analytical process is an attempt to read the shifting balance between the two forces from price spread, closing position, and volume.
This is the analytical law, and it should not be confused with the zone-drawing concept popular in smart-money styles. Supply and demand zones mark rectangles where imbalances originated; the Wyckoff law is a continuous reading of which side is in control right now, on every bar and every wave. The law says nothing about drawing boxes. It asks a running question: is the buying or the selling dominant, and is that dominance strengthening or fading?
Traders care because the law converts raw price and volume into a narrative with testable implications. A wide-spread up bar closing on its high with strong volume shows demand overcoming supply. A rally on shrinking spread and volume shows demand tiring even though price is still rising. Inside a trading range, the same reading decides whether the range is absorbing supply before markup or feeding distribution before markdown, which is why the law sits underneath concepts like absorption rather than beside them.
How to read supply and demand on a chart
The law is applied bar by bar and wave by wave, always as a relationship between price behavior and the volume that produced it.
- 1For each meaningful bar, note the spread (range), the position of the close within that range, and the volume relative to recent bars.
- 2Rising price on expanding spread and volume, with closes near the highs, indicates demand in control; the mirror image indicates supply in control.
- 3Watch for the imbalance to fade: progress that shrinks while volume stays heavy suggests the dominant side is meeting opposition.
- 4Compare successive waves in the same direction: each buying wave should travel further per unit of volume if demand truly dominates.
- 5Treat sideways movement as near-balance, and look for the bar behavior that reveals which side is quietly gaining the upper hand.
How traders use it
- As the base layer of Wyckoff chart reading: every phase label in an accumulation or distribution range is ultimately a claim about which side currently controls the auction, judged through spread, close, and volume.
- To qualify breakouts: a move out of a range on expanding spread and volume shows a genuine imbalance, while a breakout on narrow spread and light volume is suspect regardless of how clean the level looks.
- To anticipate turns early: demand can be seen drying up on rallies, or supply drying up on declines, several bars before price itself reverses. This read is probabilistic, not certain, and works best with confirmation.
- As context for entries from other methods: many traders keep a supply and demand read running in the background and only take setups aligned with the side in control.
- With honest limits: volume is ambiguous on any single bar, since one print contains both buying and selling. The law is read from sequences and tendencies, never from one bar in isolation.
The Wyckoff law vs adjacent concepts
Supply and Demand Zones: Zones are static rectangles drawn where a sharp move originated, used as future reaction areas. The Wyckoff law is a dynamic reading of the balance of buying and selling pressure, applied continuously rather than at marked levels.
Effort vs Result: Effort vs result is the companion Wyckoff law that compares volume (effort) with price progress (result). It is the main diagnostic tool for detecting when the supply and demand balance is shifting.
Cause and Effect: Cause and effect governs how much movement a period of preparation can support. Supply and demand explains the direction of movement; cause and effect addresses its potential extent.
Concept family
Wyckoff
17 concepts mapped · 17 in the Library
Supply & Demand FAQ
Is this the same as supply and demand zones?
No. Zones are a level-marking technique from smart-money styles. The Wyckoff law is a continuous read of which side controls price, made from spread, close, and volume, with no boxes involved.
Can you actually see supply and demand on a chart?
Not directly. You see their footprints: the relationship between price movement and volume. The inference is indirect and improves with practice, but it is never certain on any single bar.
Does the law work on markets with unreliable volume, like spot forex?
It weakens. Tick volume is a rough proxy and many practitioners read futures volume for the related market instead. Price spread and close position still carry some of the information.
How do the three Wyckoff laws fit together?
Supply and demand gives direction, cause and effect estimates how far a move can carry, and effort vs result flags when the current move is failing. Wyckoff analysis uses all three at once.
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