Concept
No-demand / No-supply Bars
No-demand / No-supply Bars are Volume & Order Flow concepts. The Library holds 1 implementations, each one a working definition you can pull into Quant.
Top No-demand / No-supply Bars indicators
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What are No-demand / No-supply Bars?
No-demand and no-supply bars are classifications from Volume Spread Analysis (VSA), the school Tom Williams developed out of Wyckoff's effort vs result logic. A no-demand bar is an up bar (close above the prior close) with a narrow spread and volume lower than each of the previous two bars: price rose, but no professional money chased it, so the rally is suspect. A no-supply bar is the mirror image: a down bar with a narrow spread on volume below the previous two bars, a dip with no real selling behind it.
Neither bar means anything on its own in VSA. They are read against the background: no-supply appearing after signs of strength is treated as a successful test that clears the way higher, while no-demand appearing after signs of weakness argues the upmove is a rally to sell into.
How traders use it
- As continuation filters: in a market showing background strength, no-supply pullbacks are used to time longs; in background weakness, no-demand rallies are used to time shorts.
- As test confirmation: after stopping volume or a shakeout, a later no-supply bar suggests sellers are exhausted, with the next bar's close commonly required as confirmation.
- As a warning against chasing: a breakout attempt built on no-demand bars lacks the volume signature VSA expects from genuine markup.
Related concepts · VSA (volume spread analysis)
Concept family
Volume & Order Flow
87 concepts mapped · 62 in the Library
No-demand / No-supply Bars FAQ
What qualifies as a no-demand bar in VSA?
The common definition is an up close, a spread narrower than recent bars, and volume lower than each of the previous two bars. Many practitioners add context requirements, such as appearing after weakness or into resistance, before treating it as tradeable. Exact thresholds vary by author, so tools implementing it make those cutoffs explicit parameters.
Is a no-supply bar a buy signal?
Not by itself. VSA treats it as evidence, not a trigger: it says sellers failed to show up on the decline. It becomes actionable when the background already shows strength, such as accumulation or stopping volume, and the following bar confirms by closing back up. In a genuine downtrend, low-volume dips are normal and prove nothing.
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