Introductory5 min2026-05-13Open

Support & Resistance

The single most important concept in technical analysis. The 'walls' where price stalls, bounces, and swaps roles — explained through order clustering and crowd psychology.

SupportResistanceLevelsRound Numbers

Overview

Support is a level price struggles to fall below; resistance is a level it struggles to rise above. No concept in technical analysis is more universal. Trend lines, chart patterns, Fibonacci — at bottom, they are all just other ways of saying "where is the support and resistance".

What matters: treat S/R as a zone, not a line — and understand why price stalls there. Once you understand the why, you can also anticipate the moment it breaks.

Role reversal at the ¥3,000 level — three rejections from resistance, a decisive break, then a retest that holds as new support — A level that rejected price three times finally gets cleared on a closing-basis break. When price returns, the same level now holds as support — the psychological consequence of regret-driven limit buys stacking on the retest.View OANDA:USDJPY live →

Where Support / Resistance Forms

1. Prior highs and lows (swing points)

The most basic S/R. A low that bounced repeatedly tends to be support again. A high that capped price repeatedly tends to be resistance again. This is Dow Theory's "structure of highs and lows" itself.

2. Round numbers

USDJPY at 150.00, 151.00; a stock at ¥1,000, ¥3,000 — humans psychologically cluster orders at round numbers. Limit orders ("sell at exactly 150") stack there, so price tends to stall. Levels ending in 00 (150.00) are watched more strongly than levels ending in 50 (150.50).

3. High-volume price zones (volume profile)

A zone where heavy trading occurred means many participants hold positions from there. When price returns, their "break-even exits" and "averaging-down" tend to appear, making it S/R.

4. Dynamic levels (moving averages, etc.)

Famous moving averages (the 200-day, etc.) are watched by many, so they can act as S/R themselves. → See Moving Average

Role Reversal (Resistance ⇄ Support)

The single most important principle in S/R theory:

Resistance, once broken, becomes support. Support, once broken, becomes resistance.

Example: a stock capped at ¥3,000 repeatedly (resistance) → one day it clearly clears ¥3,000 → afterwards, when a pullback returns to ¥3,000, it bounces there (now support).

✦ Market Psychology

Role reversal happens because of participant emotion and positioning.

When ¥3,000 was resistance, there were people wanting to "sell at ¥3,000" and people wanting to "buy if ¥3,000 breaks". When price clears ¥3,000:

The sellers are forced to cover → buying pressure
The breakout-waiters buy → buying pressure
Those who couldn't buy below ¥3,000 think "I'll buy if it returns to ¥3,000" → pending pullback buys

So when price returns to ¥3,000 after the break, limit buy orders from people carrying "regret at not buying earlier" are stacked there. That is why it bounces. Role reversal is not magic — it is the psychology of regret and opportunity.

Conversely, when even a role-reversed level breaks, it means participant conviction has genuinely collapsed. A break that fails to hold on the retest was probably a fakeout.

Treat S/R as a Zone

A beginner's mistake is treating S/R as a single line ("exactly ¥3,000"). In reality price reacts in a zone ("¥2,980–¥3,020").

Why:

Wicks and bodies stop at slightly different levels
Institutions split orders across a range, not at one price
Past bounce points were never perfectly aligned either

So instead of "stop out one tick below ¥3,000", think "stop out if the close clearly breaks the ¥2,980 zone".

How to Use It

Counter-trend: buy the pullback at support

Identify a clear support zone (multiple touches, ideally higher timeframe)
Wait for price to fall into the zone
Confirm signs of a bounce within the zone (lower wick, volume increase, a reversal candle)
Buy after confirmation — do not catch the falling knife
Stop on a clear break below the zone
Target the next resistance zone

With-trend: breakout + retest

A clear close-basis break above resistance
Don't chase; wait for the retest (pullback to old resistance = new support)
Buy if the retest bounces
Stop on a clear break below the new support (the break was a fakeout)

Waiting for the retest avoids most fakeouts. But in strong trends price may run without retesting, and you miss it. That is a trade-off.

Chart Example

Resistance flipping to support after a break — After breaking ¥3,000 resistance, a retest shows the level acting as new support — the classic role reversal.

Limitations

Many fakeouts: especially wick-only breaks
Discretion in where the "zone" ends
Powerless against strong trends or news: any S/R can be pierced
Hindsight-prone: often you only know "that was support" after the bounce

Dow Theory: highs and lows form S/R
Trend Lines: diagonal S/R
Moving Average: can act as dynamic S/R

Related Studies

← Other Studies