Factor Investing — Smart Beta ki Duniya

Fama aur French ne 1990s mein research se paya ki sirf market beta se returns explain nahi hote. Certain characteristics wale stocks systematically better ya worse perform karte hain than market overall. In characteristics ko 'factors' kehte hain.

Original Fama-French model mein teen factors the: market risk premium, size premium (small caps beat large caps), aur value premium (low valuation stocks beat high valuation ones). Baad mein momentum, profitability, aur investment factors bhi add hue.

Factor investing ka appeal hai ki yeh systematic aur rules-based hai. Koi individual stock selection skill ki zarurat nahi. Sirf define karo ki kaunse characteristics ke stocks chahiye aur rebalance karte raho. Passive approach but with potential for excess returns over simple market cap weighted index.

Value Factor: Low valuation wale stocks, measured by P/E, P/B, EV/EBITDA ratios historically better returns dete hain. Intuition: market temporarily underprices certain stocks aur mean reversion hota hai.

Momentum Factor: Recent period mein strong performers next period mein bhi outperform karte hain on average. Usually measured as 12 minus 1 month return, last month exclude karke recency bias se bachne ke liye.

Quality Factor: High profitability, low leverage, aur stable earnings growth wale companies outperform. Measured by ROE, ROA, gross margin, aur debt to equity.

Low Volatility Factor: Kam volatile stocks surprisingly better risk adjusted returns dete hain than high beta stocks. Yeh counter-intuitive hai kyunki finance theory kehti hai zyada risk lene pe zyada return milna chahiye. Lekin empirically low vol stocks overperform on risk-adjusted basis.

Size Factor: Small cap companies large caps se historically better long term returns dete hain, lekin zyada volatility ke saath.

Factors work karte hain on average aur over long periods. Lekin individual years ya even decades mein significant underperformance possible hai. Value factor 2010 to 2020 tak US markets mein bahut underperformed. Investors jo is decade mein value factor follow kar rahe the woh bahut frustrated the.

Factor timing bahut mushkil hai. Koi reliable way nahi hai yeh predict karne ka ki kab kaunsa factor outperform karega. Jo investors factors switch karte rehte hain based on recent performance, woh generally worse perform karte hain.

Factor crowding ek growing concern hai. Jab bahut saare investors same factor pe bet karte hain, woh factor ke expected return compress ho jaate hain. Smart beta ETFs ke popular hone ke baad yahi problem ho rahi hai. Originally documented factor premiums ab partially arbitraged away ho gaye hain.