Understand market session phases — Hinglish notes

4.4.1 · Stock-Market › When to Trade — Timing & Sessions

Session phases exist kyun karte hain?

Phases KAISE hote hain?

Figure — Understand market session phases

Har phase ke baare mein HOW sochein (derive karo, memorise mat karo)

Hum expected behaviour ko do simple quantities se derive kar sakte hain.

Formula Volatility as a function of information flow

Maano $I (t)$ = nayi information aane ki rate, aur $P (t)$ = time $t$ par active participants ki sankhya.

Step 1 — Price kyun move karta hai: Price tab move karta hai jab orders imbalanced hote hain. Imbalance ke liye chahiye (a) ek reason (information $I$ ) aur (b) koi us par act karne wala (participation $P$ ).

Step 2 — Combine karo: Instantaneous volatility (price wiggles ka size) product ke saath scale karta hai: $σ (t) \propto I (t) \cdot P (t)$ Product kyun aur sum kyun nahi? Agar koi bhi factor zero ho, toh volatility nahi hoti: news with nobody trading (holiday) → kuch nahi hilta; bhaari crowd but zero news (dead lunch) → kuch nahi hilta. Product tab zero hota hai jab koi bhi ek term zero ho — sum nahi hota. Isliye multiplication "dono chahiye" wali logic capture karta hai.

Step 3 — Phases padhte hain:

Open: $I$ bahut zyada (overnight backlog ek saath dump hota hai), $P$ high → $σ$ max.
Midday: $I$ low, $P$ low → $σ$ min.
Close: $I$ moderate but $P$ spike karta hai (rebalancing/squaring) → $σ$ phir high.

Yahi classic U-shaped (smile) intraday volume/volatility curve reproduce karta hai — dono ends par high, middle mein low.

Worked examples

Common mistakes (steel-manned)

Active recall

Recall Explain like I'm 12 (Feynman)

Ek school day imagine karo. Jab subah ghanti bajti hai, sab ek saath bol rahe hain raat ko kya hua — bahut shor aur pagalpan. Yahi market open hai. Lunch mein, aadhe bacche so rahe hain — quiet aur boring; yahi midday hai. Phir ghar jaane se pehle last-bell ki rush, sab apna saman pakadne ki afra-tafri mein — phir shor; yahi close hai. Market mein subah ki rush hoti hai, ek soyi hui lunch hoti hai, aur ghar jaane ki rush hoti hai. Prices dono rushes ke dauran sabse zyada jump karti hain.

Flashcards

Market open par volatility sabse zyada kyun hoti hai?

Overnight information (

I

) pile up hoti hai aur ek saath release hoti hai jabki bahut saare participants (

P

) act karte hain — product

I \cdot P

peak karta hai.

Intraday volume/volatility U-shaped kyun hoti hai?

Open par high information + participation aur close par high participation (rebalancing/squaring) hoti hai, midday mein dono low hote hain. Kyunki

σ \propto I \cdot P

, dono ends high hain, middle low hai.

Pre-open indicative price aur opening price mein kya fark hai?

Indicative price provisional hoti hai aur auction orders aane par update hoti hai; opening price final auction equilibrium hai jo continuous trading start karta hai.

Slippage minimize karne ke liye bada order kab route karein?

High-participation phases (open/close) mein jab order book deep hota hai.

Midday range/mean-reversion traders ke liye kyun suit karta hai?

Low information aur participation → low volatility → price trend karne ki bajaye ek band mein oscillate karti hai.

Open par gaps kyun aate hain?

Overnight information opening auction ke zariye ek single print mein price hoti hai; raat bhar continuous trading nahi hoti, toh jump gap ki tarah dikhta hai.

Volatility ko

I \cdot P

ke product se model kyun karein sum se nahi?

Product tab zero hota hai jab koi bhi factor zero ho (news with no traders, ya traders with no news), jo real "dono chahiye" behaviour se match karta hai.

Connections

Liquidity and Bid-Ask Spread — thin midday books tumhe kyun cost karti hain.
Slippage and Order Execution — bade orders fill karne ke liye phases choose karna.
Opening Auction Mechanism — opening price kaise discover hoti hai.
Intraday Volume Profile — empirical U-shape.
Volatility — $σ \propto I \cdot P$ intuition generalized.
Gap Trading — overnight-information jump trade karna.