If the stock market were a person, the P/E ratio would be its mood ring. Sometimes euphoric (P/E of 40+), sometimes depressed (P/E of 10), and occasionally calm and rational (P/E of 20-22). As an investor, reading this mood correctly can be the difference between buying opportunity and buying into a bubble.
Price-to-Earnings ratio = Current Stock Price ÷ Earnings Per Share (EPS). If Infosys trades at ₹1,500 and its EPS is ₹60, the P/E is 25. This means you're paying ₹25 for every ₹1 of the company's annual earnings.
The Nifty 50 P/E historically averages around 20-22. When it crosses 30, the market is overheated — proceed with caution. When it falls below 15, the market is offering a significant discount — consider increasing SIP amounts or making lump sum investments.
During COVID-19 (March 2020), the Nifty P/E crashed below 20. Investors who bought then saw returns of 100%+ in under 2 years. This is not speculation — it is disciplined, value-driven investing.
P/E is a snapshot, not a movie. It doesn't account for growth rate (which is why the PEG ratio exists), doesn't work well for loss-making companies, and can be distorted by accounting policies. Always use P/E in context — compare it to the company's own historical P/E, its sector peers, and broader market averages.
The Zen concept of shoshin (beginner's mind) is instructive here. When analyzing a P/E, approach it fresh each time. A P/E of 30 might be expensive for a PSU bank but cheap for a high-growth SaaS company. Never apply mental shortcuts without context. The market rewards those who think deeply and act patiently.
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