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Why your feelings are the worst adviser in your investing journey
“At the start of a decision, intuition is unreliable. The patterns you’ve detected in the past might not apply to the present.” — Adam Grant.
Executive summary
Modern markets are optimized to punish gut feel.

Judgment fails for two reasons:
  • Bias (predictable errors like loss aversion, overconfidence, framing).
  • Noise (random variability — same person, same question, different answer depending on mood, time, fear level).
In finance — where the information firehose is relentless and incentives at the point of sale can be conflicted — feelings amplify headlines, not signal. You feel urgency, you feel certainty, you feel “I’m missing it,” and those feelings are exactly what the market sells you.
The durable edge isn’t “better instincts.” It’s better process:
  • AI-assisted signal extraction, not social noise.
  • Rules that convert context into one next action.
  • Clean incentives that keep analysis separate from product push.
Think less “trust your gut,” more “trust your process.”
Intuition’s two defects: bias and noise
Daniel Kahneman and co-authors make an important distinction. Bias pushes us consistently off target (example: we hate losing more than we like winning, so we panic-sell at the bottom and underinvest in calm times). Noise is different: it’s the random wobble in our judgment.
Noise is the part nobody talks about:
  • You can give two different answers to the same risk question just because you slept badly.
  • Two equally smart colleagues can look at the same chart and reach opposite reactions just because one saw a scary headline an hour earlier.
Bias + noise = expensive decisions.
Structured, rules-based workflows reduce both. That’s why they repeatedly outperform ad-hoc, feeling-led choices.
Adam Grant’s version of this is simple: intuition is allowed to generate ideas, not to execute trades. You validate feelings against base rates, data, and pre-committed rules before you act, not after.

The receipts: what happens when people “trade their instincts”
The data has been screaming this for 20+ years.
  • In a study of 66,465 brokerage accounts, the most active individual traders materially underperformed. “Trading is hazardous to your wealth” became a finance cliché because it’s true.³
  • In 2024, the average equity investor made about 16.54%. The S&P 500 did roughly 25%. That’s an 848 basis point gap in a single year.⁴
  • That gap did not come from “not having access.”
  • It came from timing — buying late into hype, selling early into fear.
It gets worse: trying to outsource intuition to a “star picker” doesn’t solve the problem. SPIVA’s Europe Persistence Scorecard shows that very few “outperforming” funds stay outperformers across multiple periods. You cannot reliably pick last year’s hero and expect it to repeat.⁵
So the story is consistent:
  • Fast, emotional decisions cost you.
  • Chasing heat costs you.
  • Manager-chasing costs you.
The impossible math of attention
Here’s why your brain is outgunned.
The world is on track to generate around 181 zettabytes of data in 2025 — that’s well over a trillion gigabytes every single day.
Daily reality looks like this:
  • ~376 billion emails get sent.
  • X/Twitter adds hundreds of millions of posts.
  • Bloomberg Terminal users fire off ~8 million news searches per day.
  • Reuters pushes out roughly 2 million stories a year.
Regulators and central banks literally track daily “news sentiment” now, because narrative velocity has become a macro variable.

Your feed feels like “I’m staying informed.” What’s actually happening is: your attention is being harvested. And attention ≠ insight. Your nervous system is tuned to respond to what’s loud, recent, vivid, emotional. The market quietly invoices you for that.

The comfort trap: your broker app makes you feel safe — and that’s dangerous
Something new happened in the last few years: frictionless confidence.

Trading apps now feel like banking apps. Clean design, green up-arrows, “Top Movers,” “Most Bought Today,” “Unusual Volume,” “Trending in your network.” You can buy in seconds. You get push notifications at 22:47 saying “Investors like you are moving into [X].”

That creates an illusion of:
  • control (“I can act instantly”),
  • safety (“this is normal, everyone’s doing it”), and
  • urgency (“if I don’t act I’m behind”).
It also creates bubbles. Here’s the loop:
  1. Something starts moving (AI, EV batteries, a meme stock, a coin).
  2. Apps amplify it: “Most bought,” “Top gainer,” “[Ticker] is trending.”
  3. Retail piles in because “everyone else” is piling in.
  4. Price spikes, not because cash flows changed, but because attention did.
  5. Late money buys the top.
  6. The thing reverses. Liquidity vanishes on the way down.
  7. Confidence evaporates, losses crystallize.
This is the modern micro-bubble. It’s not a 10-year housing bubble. It’s a 10-day theme bubble. You’ve seen it in AI-adjacent names, EV suppliers, clean energy, meme stocks, altcoins.

ESMA and multiple national regulators are openly concerned about “gamification”: confetti, “top x% of traders,” trophies, and reward loops that push retail toward higher-risk, higher-frequency activity under a veneer of empowerment. The OECD and CFA Institute are now tracking finfluencer-driven FOMO, because people are buying not on audited fundamentals, but on “everyone’s getting in right now.”

The most expensive belief in this system is: “If it turns, I’ll get out fast.” That’s overconfidence bias talking. When stress actually hits, spreads widen, bids disappear, and you do not exit “fast.” You exit at a discount. Kahneman would call this the planning fallacy in financial form: we massively overestimate our ability to execute under pressure. The app makes you feel safe. The structure makes you fragile.
The human stack: the biases that cost you money
Let’s be honest about the firmware you’re running:
  • Loss aversion: You hate losing more than you like winning. So you sell in fear, and you underinvest in calm periods.
  • Overconfidence: “I’ll know when to exit.” Data says: usually, you won’t.
  • Recency bias: Whatever just happened feels like what will keep happening. That’s how you buy tops and sell lows.
  • Anchoring: “I’ll dump it when it gets back to 50.” The market doesn’t care about your entry price. Anchoring locks your capital in yesterday’s story.
  • Herding / social proof: “Other people like me are buying.” Of course they are — the app literally told you that to trigger you.
  • Status quo bias / inertia: “I’ll clean this up later.” You won’t. ESMA shows how quietly staying in high-fee or unsuitable products compounds into long-term underperformance.
  • Availability bias: Your brain trusts vivid personal stories (“my friend doubled on crypto”) more than boring statistics (“most people underperform because of timing”). That’s how anecdote beats math.
You’re not irrational. You’re just built for physical threat assessment, not real-time macro allocation.
The unwritten “laws” you rely on — and why they break in markets
These are rules that work in normal life and fail in finance:
  • Coherence feels like truth. A clean story (“AI will eat the world, therefore buy AI now”) feels safe. But if you’ve heard the story in mainstream channels, it’s already priced in.
  • Speed feels like competence. Confident, instant answers look smart in meetings. In markets, “fast” usually means “unfiltered.” Kahneman: fast thinking is where bias and noise live, not accuracy.
  • Emotion feels like relevance. If it scares or excites you, it must matter. In markets, emotion mostly maps to volatility, not actual relevance to your long-term outcome.
  • Personal experience feels like evidence. “I lost money on tech once, tech is dangerous forever.” “My friend made money in crypto, crypto is easy.” That’s not analysis. That’s availability bias.
Markets are optimized to punish these shortcuts.
A better substitute for gut feel: decisions as a system
Here’s what works. It’s not sexy. It’s effective.

1. Data & AI first (classify, don’t crystal-ball).
Classify the macro regime. Measure cross-asset risk and correlation. Layer simple technical context to pace, not predict. The point is not “guess the top.” The point is “know where you’re standing.” AI is good at this: filtering, ranking, suppressing irrelevant noise.

2. Personalization with guardrails.
You pre-commit — in calm mode — your:
  • risk tolerance,
  • liquidity buffer,
  • drift bands,
  • max single-position size,
  • acceptable fee drag.
Then every alert becomes:
“You’re outside your band. Rebalance yes/no?” Not “🚨 THIS STOCK IS ON FIRE 🚨”. Decision hygiene means you’re not improvising under cortisol.

3. Clean incentives.
You want analysis that’s not being paid to shove you into higher-fee wrappers, structured products, or high-churn trades. ESMA is very direct: distribution incentives and ongoing costs, not just “bad picks,” quietly destroy household outcomes.

4. Behavior metrics, not just return screenshots.
Institutions track risk drift, tracking error, value-at-risk.
You should track:
  • Plan adherence (did I stay in my own rules?),
  • Decision latency (how long I waited to act when a rule triggered),
  • Timing gap (my actual money-weighted return vs. what I would’ve had if I’d just stuck to strategy).
That timing gap is FOMO’s invoice.
Monday Morning Playbook
So what do you actually do now — not in theory, but literally next week?

Step 1. Write the rules before you feel anything
Set in writing:
  • Your risk tolerance (how much drawdown you can actually stomach without bailing).
  • Your liquidity runway (cash you must not touch).
  • Allocation bands (how far positions can drift before you act).
  • Max position size.
  • Fee ceiling.
If it’s not written, it’s wishful thinking. Don’t lie to yourself with “I’ll just know.” You won’t.

Step 2. Reduce the firehose to one next action
Once a week, not ten times a day, ask: “Am I outside any of my bands?”If yes, take that one action (rebalance, resize, deploy idle cash). If no, do nothing. That’s it. If your “signal” is “everyone in my feed is buying,” that’s not signal — that’s pressure.

Step 3. Kill the casino loop in your pocket
Your app is designed to make you act fast. Fast = sloppy. Sloppy = expensive.
Do this:
  • Turn off push alerts for anything except actual account events (funding, settlement, compliance).
  • Ignore “Top Movers,” “Most Bought,” “Trending in your network,” “Unusual volume.”
  • Stop letting other people’s urgency become your conviction.
If you build product: ship fewer dopamine levers and more guardrails. ESMA is already looking at gamification and inducements. You either get ahead of that, or you get regulated into it.

Step 4. Start tracking behavior like a professional
Make a tiny log:
  • Date
  • What you did (“sold X,” “added Y,” “did nothing”)
  • Why (“band breach,” “needed liquidity,” or “panic/FOMO”)
  • Result 30 / 90 days later
Then calculate monthly:
  • Plan adherence (% of time you stayed inside rules)
  • Decision latency (how long you froze when action was triggered)
  • Timing gap (your money-weighted return vs just sticking to plan)⁴
That timing gap is the real cost of your feelings.

Step 5. Separate what’s yours from what’s being sold to you
Every euro, every position should live in a declared bucket:
  • Long-term compounding capital
  • Safety / liquidity buffer
  • High-risk speculative money I can emotionally afford to lose
If something doesn’t clearly belong in any bucket, you’re not investing — you’re collecting noise. Also: write down the total cost you’re paying annually (ongoing charges, spreads, tax drag). If you don’t know what you’re paying, assume you’re overpaying.
The bottom line
You’re not bad at money because you’re emotional. You’re emotional because you’re human.
But you are trying to survive a machine-speed, incentive-loaded, 24/7 narrative market with hardware that evolved to decide “run or fight.”
So you have two choices:
  • Keep playing on instinct and keep paying the timing gap.
  • Or build a tiny, boring decision system that protects you from your own worst moments.
Discipline is not a personality trait.
Discipline is architecture.
Your future self doesn’t need you to be fearless.
It just needs you to still be in the game.
Notes & sources
  1. Adam Grant, comment on intuition reliability (2021), X (formerly Twitter).
  2. Daniel Kahneman, Olivier Sibony, Cass Sunstein, “Noise: How to Overcome the High, Hidden Cost of Inconsistent Decision Making,” Harvard Business Review.
  3. Brad Barber & Terrance Odean, “Trading Is Hazardous to Your Wealth,” Journal of Finance. High-turnover investors significantly underperform.
  4. DALBAR, Quantitative Analysis of Investor Behavior (2025 release, reporting 2024 data). Average equity investor ~16.54% vs. S&P 500 ~25%, an ~8.48 percentage point gap driven by buying late/selling early.
  5. S&P Dow Jones Indices, SPIVA Europe — Persistence Scorecard (Year-End 2024). Very low persistence in outperformance across periods.
  6. IDC, global data generation estimates for 2025 (~181 zettabytes; >1 trillion GB/day).
  7. DemandSage and related email telemetry data (~376B emails/day, mid-2020s).
  8. Industry estimates of X/Twitter daily post volume (hundreds of millions/day).
  9. Bloomberg Terminal usage disclosures (millions of daily news queries).
  10. Reuters Group output estimates (~2M stories/year).
  11. Federal Reserve Bank of San Francisco, Daily News Sentiment Index. Central banks using high-frequency narrative flow as macro input.
  12. OECD, Improving the Digital Financial Literacy of Crypto-Asset Users (2025); CFA Institute work on finfluencers and social-driven FOMO.
  13. Do Algorithms Make Better—and Fairer—Investments than Angel Investors?, Harvard Business Review. Models outperform unaided human selection in noisy judgments.
  14. ESMA, Costs and Performance of EU Retail Investment Products 2024, plus ESMA / FCA commentary on inducements and “gamification” of trading UX.
  15. McKinsey & Company, How AI Could Reshape the Economics of the Asset-Management Industry (2025). AI as classification, risk-mapping, triage — not magic prediction.