Price moves only because of the imbalance between buying pressure (D, demand) and selling pressure (S, supply).
Let net order flow at price p be:
F(p)=D(p)−S(p)
If F(p)>0 → more buyers than sellers → price rises.
If F(p)<0 → more sellers than buyers → price falls.
If F(p)=0 → equilibrium → price stalls.
The derivation of support is therefore: solve for the price where flow flips from negative to positive.
psupport:F(p)=0 and F′(p)>0
The condition F′(p)>0 (flow is increasing through zero) means as price rises above the level, buying dominates → it acts as a floor.
Symmetrically:
presistance:F(p)=0 and F′(p)<0
Here flow flips from positive to negative → sellers take over → ceiling.
A price zone where demand overpowers supply, stopping a fall and often pushing price up.
What is resistance?
A price zone where supply overpowers demand, stopping a rise and often pushing price down.
Mathematically, support occurs where net flow F(p)=0 with what slope condition?
F′(p)>0 (flow increasing through zero → buyers dominate above it).
Why is S/R a zone, not a line?
Thousands of traders/algos disagree on the exact price, so reactions happen across a band.
Minimum touches to call something S/R?
At least 2 reversals within the tolerance zone; more = stronger.
What is role reversal (polarity flip)?
Broken support becomes resistance and broken resistance becomes support.
Why does broken support become resistance?
Buyers trapped at the old level sell at break-even when price returns, capping it.
Does a wick below support count as a break?
No — you need a candle CLOSE beyond the level, ideally on volume.
Why can a heavily-tested level break more easily?
Each test consumes the resting orders there, depleting the demand/supply.
What confirms a breakout is genuine?
A close beyond the level accompanied by high volume (and often a successful retest).
Recall Feynman: explain to a 12-year-old
Imagine a bouncy ball dropping in a room. The floor stops it from falling — that's support. The ceiling stops it from flying up — that's resistance. The ball (price) bounces between them. But the floor is old wood: if the ball hits it too many times, or hits super hard, it breaks through — and then that broken floor becomes the new ceiling for the room below. Traders watch these floors and ceilings because the ball usually turns around there.
Dekho, support aur resistance market ke floor aur ceiling ki tarah hote hain. Support woh price zone hai jahan buyers aa jaate hain — unhe lagta hai stock "sasta" ho gaya, toh demand badh jaati hai aur price girna ruk jaata hai. Resistance woh zone hai jahan sellers haavi ho jaate hain — price "mehnga" lagta hai, supply badh jaati hai, aur price upar jaana ruk jaata hai. Simple funda: jahan price pehle bhi ruka tha, wahin dubara react karne ke chances zyada hain, kyunki logon ki "memory" us level pe kaam karti hai.
Yeh ek exact line nahi, balki ek zone hoti hai — thoda upar-neeche wick aana normal hai, isiliye ek chhote band ki tarah socho, ek pixel ki tarah nahi. Level kitna strong hai? Jitni baar price wahan se palta (touches) aur jitna zyada volume, utna strong. Par yaad rakho — bahut zyada test hone par level ke resting orders khatam ho jaate hain, toh woh todne ke chances bhi badh jaate hain.
Sabse important cheez: break tabhi maano jab candle us level ke paar CLOSE kare, sirf wick nikalna break nahi hota (woh aksar stop-hunt hota hai). Aur jab support toot jaaye toh woh resistance ban jaata hai, aur toota hua resistance support ban jaata hai — isko role reversal ya polarity flip kehte hain. Trapped traders break-even pe nikalte hain, isiliye yeh flip hota hai.
Trading mein iska matlab: support ke paas buy socho, stop uske thoda neeche; resistance ke paas caution rakho; aur breakout tabhi trust karo jab volume saath de. Bas yahi teen cheezein — zone, close, aur volume — S/R ka pura khel samjha deti hain.
Test yourself — Support, Resistance & Price Action
