PaisaHiranyagarbha · Class 11-12
Interest ka asli rang: real vs nominal
Bank mein paisa badh raha hai — par kya tum sach mein ameer ho rahe ho?
Socho pehle… phir dekho jawab
Sirf number badhne se kuch nahi hota. Agar cheezon ke daam (inflation) tumhare interest se tez badhein, toh tumhara paisa asal mein kam cheezein khareed paayega. Asli kamaai = interest − inflation (lagbhag).
Compound interest: A = P(1 + r)ⁿ — yeh Class 11 ki GP hi hai. Example (sirf samjhaane ke liye): ₹10,000 par 7% saalana compound, 10 saal mein lagbhag ₹19,670. Har saal interest par bhi interest milta hai, isliye curve ante mein tez chadhta hai. Shortcut: 'Rule of 72' — 72 ÷ rate ≈ paisa double hone ke saal.
Ab inflation: agar daam har saal 6% badhein (example), toh wahi rule kehta hai ki roughly 12 saal mein cheezein double mehengi. Real interest rate ≈ nominal rate − inflation (Fisher ka idea). 7% − 6% = sirf ~1% asli badhotri. Aur agar inflation interest se zyada, toh real rate negative — paisa dheere pighal raha hai.
Trade-off: zyada safe aur turant nikalne wale options (liquidity) aksar kam return dete hain; zyada return wale mein risk ya lock-in hota hai. Koi 'best' product nahi, bas tumhara goal, samay aur risk. Aur yaad rakho — UPI PIN sirf paisa bhejne ke liye daalte hain, paisa lene ke liye kabhi nahi.
Ghar pe try karo
Ghar mein poochho ki 10 saal pehle doodh ya petrol kitne ka tha, aaj kitne ka hai. Formula (aaj/tab)^(1/10) − 1 se average saalana badhotri nikaalo (calculator use karo). Yeh tumhara apna 'ghar ka inflation' hai.
Wow!
Paisa gullak mein 'safe' pada rahe, phir bhi har saal chupchaap chhota hota jaata hai — inflation bina aawaaz ka tax hai.
3 sawaal
- Nominal rate 8% aur inflation 5% ho, toh real rate lagbhag?
Jawab dekho
3%. Real ≈ nominal − inflation = 8 − 5 = 3%.
- Rule of 72 se 9% par paisa lagbhag kitne saal mein double hoga?
Jawab dekho
8 saal. 72 ÷ 9 = 8.
- UPI par paisa RECEIVE karne ke liye PIN daalna...
Jawab dekho
Kabhi zaroori nahi — PIN maange toh fraud ka shak karo. PIN sirf paisa bhejne/approve karne ke liye hota hai.
NCERT se jodo: NCERT Class 11 Maths — sequences and series (geometric progression) aur Class 12 Economics (Macroeconomics) — money and banking