Breaker Block vs Supply and Demand
Michael Whitman
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Trading since 2017, full-time since 2020
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YouTube creator, 137K subscribers
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Published 2026-09-08
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Updated
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Reviewed
Breaker blocks sit on the last opposite-colored candle before a swing level breaks, an area price may revisit from the far side. Supply and demand zones mark where a sharp departure started. The two are drawn by different events, but when a structure break is also a sharp departure they can land on the same candle.
The usual way to tell these apart is history: a supply or demand zone is fresh, a breaker has already failed once. That story hides a simpler point. Each is drawn by a different event, and on SPY the two events sometimes fell on the same day and marked the same candle.
What each one is
A supply or demand area marks the base a sharp move left from. A session departs hard, and the range just before it is marked as the place the move began. Supply and demand covers how the base is drawn.
A breaker block is a candle left behind by a failed swing. It is the last bar of the opposite color before the swing level gave way, and once the break closes beyond its range it becomes an area price may revisit from the far side. Breaker block covers that rule.
The trigger is what separates them. A zone answers how hard price left; a breaker answers whether a swing failed. Neither question implies the other.
Where they differ
What starts the drawing. One big session is enough for a zone. A breaker needs a swing level, a close through it and a candle behind it that the close clears completely.
How often each event happens. On SPY from 1996 the mechanical departure rule fired 110 times, while structure breaks left a breaker several times as often. Most breakers were cut by ordinary-sized closes that would never mark a zone.
What story is told on the return. A zone is said to hold because the orders that launched the move are still there. A breaker is said to hold because positions taken at the failed area want out. Both stories describe the same trade direction on the return.
Where the two rules land on one candle
When a structure break is also a sharp departure. If the break session closes more than two average ranges beyond the prior close and beyond the prior session’s whole range, the departure rule marks the prior session as a zone. If that prior session was also the last opposite candle, the breaker rule marks it too.
On SPY that overlap was not rare. Since 1996, 45 breakers came from a break session that also qualified as a departure, and in 18 of those the breaker candle was the zone candle itself. Seen from the departure side, 45 of the 110 departures (40.91%) were structure breaks that left a breaker.
What happened when price came back. Breakers born on a departure day were revisited within 20 sessions 25 times out of 45 (55.56%), against 224 of the other 320 (70.00%); Fisher p = 0.060, so this gap is within what chance could produce. On the return, 8 of the 25 closed back on the break side (32.00%) against 93 of 224 (41.52%), p = 0.398. A sharp departure did not make the area behave differently in any way this sample can detect.
Which one to use: Breaker Block or Supply and Demand?
Use the supply and demand zone when the size of the departure is your reason to care. It is the simpler rule and it fires on the one session that matters to it.
Use the breaker when your idea depends on a swing having failed. It brings a stricter precondition and a fixed candle, and it can be drawn whether or not the break session was dramatic.
Use one name per area when both rules pick the same candle. On SPY that happened 18 times; counting those as two confirmations would double the evidence without adding any.
And when the departure was sharp, do not assume the return is more likely. The departure-day breakers on SPY were, if anything, revisited less often.
Same candle, both rules: SPY, April 2025
The candle. On 2 April 2025 SPY opened at $555.05 and closed at $564.52, an up session with a range of $554.81 to $567.42.
The break. On 3 April it closed at $536.70, below the $549.68 swing low: a downward break of structure. The close was also $27.82 under the prior close, 2.86 times the prior average true range of $9.71, and below the prior session’s low. So the departure rule marked 2 April as a supply zone, and the breaker rule marked 2 April as the breaker. One candle, two names, both saying sell on the return.
The return. It came 17 sessions later. On 29 April the high reached $555.45, inside the area, and the session closed at $554.32, just under its low.
The original data
The sample. SPY’s daily open, high, low and close, taken from Yahoo Finance and covering 29 January 1993 through 2 October 2026, with breakers only from the start of 1996, since earlier opens were often just the prior close repeated. A swing needs five lower highs (or higher lows) on each side; the breaker is the nearest earlier candle of the opposite color, used only if the break close clears its full range; a return means any of the following 20 sessions trading back inside that range.
The departure rule. The mechanical zone rule used across this site’s supply and demand comparisons: a session whose close lands at least 2 times the prior 14-session average true range (Wilder) past the previous close, and also past that previous session’s high (for a rise) or low (for a fall); the previous session’s high-to-low span becomes the zone. It was applied to every breaker’s break session, in the break’s own direction.
The counts. 45 breaker breaks were departures (12.33% of breakers); 18 shared the candle; 110 departures in all since 1996. Returns 25 of 45 against 224 of 320; held 8 of 25 against 93 of 224. The file has one row per breaker with the departure flag, the move in average ranges and the shared-candle flag: SPY breaker table with departure flags.
When it fails
The failure is stacking the two labels and treating the stack as strength. A sharp drop breaks a swing low. The candle before it is drawn as a supply zone because of the drop, and as a breaker because of the swing. A trader sees two reasons to sell the return and sizes up. On SPY, 18 times that was a single candle drawn twice, and the departure-day breakers were not revisited or held any more often than the rest. The second reason was the first one with a new name.
The second failure is treating every failed zone as a breaker. A breaker needs a swing break, which most failed zones never had.
A third is drawing either one after price has reacted. Both then look perfect.
A fourth is no expiry. This page allows 20 sessions.
And a fifth is trusting a gap this small. With 45 departure-day breakers, a difference of this size can come from chance alone.
Related
Breaker block explains the last-opposite-candle rule counted here. Supply and demand explains how a departure base is drawn. And break of structure defines the swing break a breaker needs.
Before you call an area a supply zone and a breaker at once, look at which candle each rule actually picks. If it is the same candle, you have one area with two stories, and one record to keep.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.