Price-to-Earnings (P/E) ratio is a stock's price divided by its earnings per share — a quick valuation gauge. A P/E of 20 means investors are paying $20 for every $1 of annual earnings. Higher P/Es suggest growth expectations; lower P/Es suggest value or skepticism. The S&P 500's long-term average P/E is about 16; well above 25 historically signals overvaluation; below 12 signals undervaluation. Compare P/Es within an industry, not across industries (tech vs. utilities). Forward P/E uses estimated future earnings; trailing P/E uses last 12 months. Shiller's CAPE ratio (cyclically-adjusted P/E) smooths short-term distortions.
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August 22, 2026 · Aditya Gupta
Investing
Related terms
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A 401(k) is an employer-sponsored retirement plan where employees contribute pre-tax salary that grows tax-deferred until withdrawal. The…
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