Prices and businesses diverge
In the short run, a stock's price reflects how people feel about it. Over years, it tends to follow earnings. The gap between the two is where hype lives, and where both bargains and bubbles form.
Signs of hype
- The story is everywhere, and nobody mentions valuation.
- The stock has doubled on news, not on results.
- Buying is driven by fear of missing out rather than research.
- Valuation is justified with "this time is different" or a distant total market size.
Signs of fear
- Good companies fall with everything else.
- Headlines predict disaster; surveys turn very bearish. See AAII sentiment survey and The VIX (volatility index).
- Investors sell regardless of price.
Fear is often a better time to buy strong businesses than hype is.
Habits that help
- Write your thesis before buying: why you own it and what would make you sell.
- Check the numbers that matter: P/E ratio (price-to-earnings), PEG ratio, Revenue growth (TTM and forward).
- Size positions so one mistake cannot hurt you badly. See Position sizing.
- Wait a day before acting on a headline.
- Automate rules you set when calm. See Systematic investing.
See also
- Investor or trader The difference between investing and trading, why most individuals do better as long-term owners, and how costs, taxes and time favour patience.
- AAII sentiment survey What the weekly AAII investor sentiment survey measures, its long-run averages, historical extremes, and how contrarian investors read bearish readings.
- The VIX (volatility index) What the VIX fear index measures, how it is calculated from S&P 500 options, what VIX levels mean, its history of spikes, and why it tends to mean-revert.
- Investing in IPOs How initial public offerings work, why new stocks are often volatile, lock-up expirations, and how to judge an IPO with fundamentals instead of hype.
Pages that link here: Dollar-cost averaging vs lump sum, Systematic investing
Last updated September 30, 2026. Education only, not investment advice.