Disclaimer: This article is for educational and informational purposes only. It does not constitute financial advice or a recommendation to buy or sell any investment. All investments carry risk. Past performance does not indicate future results. Consult a licensed financial advisor before making investment decisions.
I bought my first investment position in a popular tech ETF in late 2021 — after it had already risen 40% that year, after everyone in my online communities was discussing it, after the news headlines were uniformly enthusiastic. The position declined 28% over the following year. I didn’t make a sophisticated mistake. I made the most common, most documented mistake in behavioral finance: I bought because everyone else was buying, and that fact alone made me feel certain it was right.
What FOMO Does to Investment Decisions
Fear of Missing Out in investing is specifically the experience of watching an asset rise and feeling that your failure to participate represents a personal loss — even though you never owned it and therefore lost nothing. This is irrational by standard economic logic and deeply predictable by behavioral psychology.
Research by Shefrin and Statman, published in Journal of Finance (1985), identified the “disposition effect” — investors’ tendency to hold losing assets too long and sell winning assets too early — as one of the most robust behavioral finance findings. FOMO is partly the disposition effect in reverse: reluctance to be left out of a winner drives buying at prices that reflect too much enthusiasm.
The Neuroscience of Market Excitement
Anticipating gains activates the ventral striatum — the brain’s reward anticipation circuit — producing dopamine-driven arousal states that are difficult to distinguish from genuine confidence. Research by Brian Knutson at Stanford, published in Neuron (2005), showed that activation of this circuit during financial decision-making predicted irrational risk-taking — subjects bet more on worse odds when the reward anticipation circuit was highly activated. Market rallies activate exactly this circuit in exactly this way.
This is why the feeling of certainty during a rally is not evidence that the rally will continue. The feeling is a neurological response to social proof and price momentum, not a reliable assessment of fundamental value.
Social Proof as Market Driver
Robert Cialdini’s foundational work on social proof, detailed in Influence: The Psychology of Persuasion (1984), shows that humans use others’ behavior as a decision shortcut — particularly in situations of uncertainty. Financial markets are uncertainty maximized. When everyone around you is buying, the social signal is overwhelming, even when fundamental analysis says otherwise.
George Soros articulated this in his concept of “reflexivity” — market prices influence the fundamentals they’re supposed to reflect, because rising prices attract buyers, which raises prices further, which attracts more buyers. FOMO is the individual mechanism through which reflexivity operates. Understanding this doesn’t make you immune to it; it helps you recognize what’s happening when you feel it.
Historical FOMO Moments and What Followed
- 1999-2000: Internet companies with no revenue were being bought by retail investors who’d watched friends and neighbors get rich in 18 months. The NASDAQ peaked in March 2000 and fell 78% over the next 30 months.
- 2006-2007: Real estate “never goes down.” Everyone knew someone who’d made money flipping houses. The S&P/Case-Shiller Home Price Index peaked in 2006 and fell 33% nationally, more in major markets.
- 2021: Meme stocks, NFTs, and speculative tech. “Diamond hands” and “apes together strong” as market philosophy. The ARK Innovation ETF fell over 70% from its peak over two years.
Each of these produced genuine widespread FOMO. Each was followed by genuine widespread loss concentrated among those who bought into the excitement late.
Practical Countermeasures
The Pre-Commitment Protocol
Decide your investment rules before markets are moving. Write them down: “I will invest a fixed amount on a fixed schedule regardless of recent performance.” Automatic regular investing (dollar-cost averaging) bypasses real-time FOMO decisions entirely — the money moves on schedule, not on feeling. This is the most evidence-backed approach to avoiding FOMO-driven buying.
The News Correlation Check
If the asset you’re considering buying is currently in general news headlines (not financial press — general news), the retail FOMO signal is already widely transmitted. That’s not a sell signal; it is a reason to wait at minimum 30 days before acting and to explicitly verify the investment thesis before executing.
The Enthusiasm Discount
Ask: “What would I need to believe about this asset’s future for the current price to be fair?” Write the answer down. Then ask: “Is there any world in which I’d be embarrassed to have believed this in three years?” This mental time-travel exercise, adapted from Daniel Kahneman’s work on prospective hindsight, produces more honest assessment than present-moment price observation.
The Honest Conclusion
FOMO never disappears. Even investors who understand the mechanism intellectually experience the pull. The goal is not to eliminate the feeling but to build systems that slow the gap between feeling and action — long enough for the prefrontal cortex to ask the questions that FOMO-driven limbic activation suppresses. The investor who has a written plan and follows it during a rally buys less of the wrong things and more of the right ones, on average, over time.
References
Part of our Behavioral Finance: 7 Cognitive Biases That Cost Investors Money guide.