CONTENT
🧠 The mental trap: why one bad week convinces you the whole thesis is dead
📊 The fix: a rule that stops you from trading on five days of noise
🔗 Smart stories: 5 things worth your 10 minutes
People are advised to think long- term, but the constant comment on every gyration puts people on edge and keeps them focused on the short term. It’s a challenge not to act on.
The mental trap: Recency bias
If you are in the market, you probably watched red numbers every day last week.
Tech and chip stocks took a beating this week. Elevated Treasury yields, profit-taking after a strong run, some geopolitical noise in the mix — the usual cocktail.
Here's the part nobody tells you: your brain is built to treat the most recent thing as the most important thing. It's called recency bias, and it doesn't care that "the last five trading days" is a laughably small sample size to judge a 10-year thesis on. Five red days feels like information. It's mostly noise wearing a trench coat.
Photo by Annie Spratt on Unsplash
This is exactly how people talk themselves into selling. Not with a spreadsheet. With a feeling. "It's been down all week, it's probably going to keep going down, I should get out before it's worse." That sentence has convinced more people to sell at the bottom than any bad earnings report ever has.
And it cuts both ways. The same bias that makes you want to bail after a bad week is the one that made you assume a hot stock would keep ripping forever a few months ago. Recency bias doesn't have an opinion about direction — it just grabs whatever happened most recently and assumes it's the new permanent trend. Up or down, it's the same broken logic.
Zoom out and the picture usually looks less dramatic. Analysts are still projecting solid earnings growth for the year. The sell-off has real causes — yields, profit-taking after a strong run — but "real causes" and "the trend is now reversing forever" are two very different claims, and your brain is quietly swapping one for the other without asking permission.
None of this means "never sell." Sometimes the thesis actually changes — new competitor, cooked balance sheet, business model dead. That's a decision made on fundamentals. What you want to catch yourself doing is making that same decision based on how many red days in a row you've watched.
The fix
Before you touch anything after a rough week, write down — actually write, don't just think it — the specific, fundamental reason the investment no longer makes sense.
Not "it's down." Not "everyone's nervous." A reason that would still hold up if the price had stayed flat. If you can't write one, you're not making an investment decision. You're reacting to a chart. Put the trade on ice for 48 hours and see if the urge survives contact with a Tuesday.
The people who came out fine on the other side of every past sell-off weren't the ones who correctly predicted the bottom. They were the ones who didn't act on a five-day mood swing in the market.
SMART STORIES
Why the market actually sold off this week — the real mechanics behind the tech and chip sell-off, no drama, just the facts.
Navigating sell-offs without wrecking your plan — a solid, boring, correct breakdown of why reacting fast is usually the wrong move.
Should you sell before the midterms? — spoiler: probably not, and the reasoning is a good gut-check against your own election-year jitters.
A Vanguard behavioral scientist on why inertia beats willpower — good listen if you want to understand why "just be disciplined" doesn't work and defaults do.
Panic selling, defined — short, dry, and worth rereading the next time you feel the urge. Naming the thing you're doing helps you stop doing it.