Auction equilibrium and imbalance

Who this entry is for — For anyone who uses POC and Value Area but does not know when to mean-revert and when to follow the trend. Steidlmayer separates two market regimes with different operational rules: equilibrium and imbalance.

Source: Steidlmayer & Koy, Markets and Market Logic (1986), pp. 72–82; Chicago Board of Trade, CBOT Market Profile®, Part I (1996), pp. 3, 9, 12–18. Cross-check: raw/sources/steidlmayer/files/chapters/cbot/part-01-lettura-grafico.txt and raw/sources/steidlmayer/files/_extract-markets-and-market-logic.txt. Time thresholds and buffers in the checklists are Cyclepedia operating heuristics, not universal rules by the authors.

Prerequisites

Steidlmayer tradition introduction, Auction Market Theory, Value Area.

Two states, two logics

The auction alternates periods where buyers and sellers find agreement on a price band (equilibrium) and periods where they fail to agree and push price towards new zones (imbalance). Confusing the two states is the most costly mistake in the Steidlmayer method: in equilibrium you seek rotation; in imbalance you seek continuation towards new value.

State	AMT name	Behaviour	Typical strategy
Equilibrium	Balance	Rotation around POC, VA extremes as boundaries	Fade at VA extremes, target POC
Imbalance	Imbalance	Directional trend, previous POC left behind	Follow direction, enter on pullbacks
Transition	Breakout from balance	Exit from VA with acceptance	Wait for retest or new VA

In plain terms — In equilibrium the market «debates» inside a box. In imbalance it has decided to move and the old box no longer holds.

How to recognise equilibrium

Operational signals of balance in the current or multi-day session:

Price oscillates above and below the POC without net extension.
Value Area narrow and overlapping the previous one (overlap).
Initial Balance contained, with no sustained breakout.
Volume distributed symmetrically at VA edges.
Contained, rotational range development. A P/b graphic shape does not replace the CBOT classification of the day.

Example — Three consecutive sessions with POC within 4 ticks of each other and VAs overlapping by >50%: multi-day balance. Operationally: short at VAH targeting POC, long at VAL targeting POC — until a volume breakout invalidates the structure.

How to recognise imbalance

Operational signals of imbalance:

Open outside the previous VA and no return within ~90 minutes.
Initial Balance extended beyond 1.5× the average (see Initial Balance).
Session POC forms at the extremes, not at the centre.
Value Area narrow and shifted relative to yesterday (value migration).
Unidirectional range development. A “Trend day” classification requires the Initial Balance, range-extension and session-close criteria.

Frequent mistake — Shorting the VAH just because «it is resistance» on a bullish trend day. In imbalance yesterday's VAH is often support on pullbacks, not a ceiling — the market has accepted higher prices.

Operational rules

Condition	Action	Logical stop
Balance confirmed, price at VAH	Fade short towards POC	Above VAH + buffer
Balance confirmed, price at VAL	Fade long towards POC	Below VAL + buffer
Bullish imbalance, pullback at LVN	Long towards IB extension	Below LVN or below session POC
Breakout from balance with volume	Wait for VA or POC retest	Inside previous VA
Uncertain transition	Stand aside until new VA forms	—

Card — Regime checklist

VA overlap: yes → balance bias; no → imbalance bias.
Return to previous VA: within 90 min → balance; absent → imbalance.
POC: central → balance; at extremes → imbalance.
Day type: P/b/T shapes do not prove the regime by themselves; use the CBOT criteria stated in the dedicated entry.