FOMO (Fear of Missing Out)
Also known as: fear of missing out, chasing, late entry
FOMO in trading is the urge to enter an extended move late, driven by watching others profit, and it shows up as poorly-priced entries on already-trending instruments.
FOMO is borrowed from social-media culture but the underlying mechanism in trading is identical: a strong move is happening, the trader did not catch the initial entry, and the discomfort of watching it run drives a late chase. The result is almost always a worse entry price, a tighter implicit stop, and an outsized vulnerability to the inevitable pullback.
Mathematically, the further into an extended move a trader enters, the worse their average risk-reward becomes. The same setup that offered 4R at the breakout offers 1R three bars later. FOMO trades, on aggregate, produce a meaningfully lower expectancy than planned setups, and their losses tend to be larger than the trader's normal risk per trade because the entry came without a defined stop in mind.
The deeper problem is that FOMO conflates 'I missed this trade' with 'I missed an opportunity.' The market produces hundreds of setups per year. Missing one is statistically irrelevant; chasing it can be portfolio-defining. The reframe most disciplined traders cite is to treat a missed setup as a sunk cost rather than as a debt to be repaid.
Entries that cluster in time around news, headlines, or already-extended price moves; entries that happen at the worst part of a candle range relative to the trader's typical entry quality.
Shows up across multiple axes: 'overtrading' (entries on hype), 'first_trade_of_day' (chasing the open), and the qualitative diagnosis letter when the pattern is concentrated.
Written in 1841, Mackay's classic is the original argument that markets are governed by mass psychology rather than reason — and the case is made with history, not theory. Tulip mania, the Mississippi Scheme, the South Sea Bubble. The same herd emotions run inside every trader on every trade, which is why your psychology often decides results more than your earnings or macro read does.
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