Behavioural Finance · Investor Psychology · Mutual Funds
Regret Aversion, Recency Bias & Herd Behavior in Mutual Funds: Why Investors Keep Repeating the Same Mistakes
A brutally honest, psychologically deep, and occasionally hilarious look at why our brains are spectacularly bad at investing — and what to actually do about it.
Picture this: It’s early 2020. The market has just crashed 35% in three weeks. Your phone buzzes constantly with WhatsApp messages. Your portfolio is bleeding. And what do you do? You stop your SIP. Fast forward to late 2021 — the market is up 120% from the lows. Now you finally start investing again, because “the market is doing great.” You have just, with remarkable precision, bought high and sold low. Congratulations. You are not alone.
This is not a story about bad luck. This is a story about being human. The investing mistakes we make aren’t random — they follow predictable, psychological patterns. Three of the most powerful and destructive of those patterns have names: Regret Aversion, Recency Bias, and Herd Behavior. Understanding them won’t just protect your portfolio. It might change the way you think about your own mind.
Your Brain Was Not Built for the Stock Market
Let’s start with an uncomfortable truth: the human brain evolved for survival on the African savannah, not for navigating Nifty 50 corrections. When a predator approached, the correct response was to run with the herd and feel intense fear. Those who hesitated in calm calculation got eaten. Those who panicked and ran survived — and passed on their genes to us.
The problem is that those same instincts are now running your Zerodha account.
When the market falls 20%, your ancient lizard brain does not distinguish between “the NAV of your mid-cap fund is temporarily down” and “a tiger is charging at you.” Both trigger the same threat response: flee, follow the crowd, do something immediately. The fact that doing something in a market crash almost always makes things worse is irrelevant to your amygdala. It doesn’t care about 10-year CAGR charts. It cares about not dying.
Studies in behavioural finance (Kahneman & Tversky’s landmark work on Prospect Theory) show that losses feel roughly twice as painful as equivalent gains feel pleasurable. Losing ₹10,000 in your portfolio feels about as bad as winning ₹20,000 feels good. This asymmetry is not a character flaw. It’s factory-installed human firmware — and it’s quietly sabotaging your long-term wealth every single market cycle.
Regret Aversion: The Bias That Paralyses and Protects at the Same Time
Regret aversion is elegant in its cruelty. It’s the tendency to make decisions not based on what’s most likely to work, but based on what will cause the least regret if things go wrong. It sounds almost reasonable until you trace the decisions it produces.
How Regret Aversion Plays Out in Investing
Imagine it’s March 2020. The market is in freefall. Every financial expert on television looks like they’ve just seen a ghost. Your brother-in-law calls to say he’s liquidating his mutual funds. The rational move — buy more, because assets are on deep discount — feels terrifyingly wrong.
You don’t buy. You tell yourself you’re “waiting to see how things develop.” What you’re actually doing is managing regret. “If I buy now and it falls further, I’ll feel like an idiot. But if I don’t buy and it falls further, at least I didn’t do anything actively wrong.”
This is regret aversion at full volume. The omission (not buying) feels safer than the commission (buying) even when the commission is the correct financial move. The mind would rather miss a 90% recovery rally than risk the regret of having “done something” that temporarily felt worse.
Now flip the scenario. The market has been rallying gloriously for 18 months. Your colleague Sandeep has been talking about his mid-cap fund returns at every team lunch. He’s up 68% in 18 months. You’ve been sitting in a savings account earning 6.5% and watching him mentally upgrade his car with every Nifty uptick.
Suddenly a different kind of regret aversion kicks in — the regret of missing out. This is just as powerful, and it pushes you in the opposite direction: invest now, at the peak, because the regret of missing further gains is becoming unbearable. Sandeep’s lunch stories are eating you alive.
- During crashes → Regret aversion paralyses you. You don’t buy even at great prices.
- During bull markets → Regret of missing out drives you in. You buy near the top.
- After buying at the top and it falls → Regret aversion stops you from selling or cutting losses early.
- When the recovery comes → You finally sell at breakeven because you just want the regret to stop.
The result: maximum emotional participation at the worst possible price points.
The “What If” Machine in Your Head
Regret aversion runs on counterfactual thinking — our brain’s relentless production of “what if” scenarios. What if I had invested in that ELSS fund in 2019? What if I hadn’t stopped my SIP in March 2020? What if I hadn’t moved money into that small-cap fund right before the correction?
These “what if” questions are deeply painful because they construct a vivid alternate reality where you made better decisions and lived a better financial life. Psychologists call this upward counterfactual thinking, and it’s one of the most reliable generators of financial regret in existence.
The cruel irony is that regret aversion, designed to help you avoid regret, actually generates more of it — because it keeps you from taking the correct actions that reduce regret over the long term.
Recency Bias: Why Last Year’s Hero Fund Is This Year’s Disappointment
If regret aversion is about the fear of feeling bad, recency bias is about the seduction of recent experience. The brain is a pattern-recognition machine, and it weights recent patterns enormously — because in natural environments, recent patterns are usually the best predictor of what happens next.
If it rained yesterday and the day before, it will probably rain today. If that predator was in the eastern part of the forest last week, it’s probably still there. Recent information is reliable. Use it.
Except in capital markets, recent performance is one of the least reliable predictors of future performance. And yet your brain treats it exactly like the weather forecast.
The Chasing-Returns Disaster
Every year, the Association of Mutual Funds in India (AMFI) publishes data on fund inflows. And every year, it tells the same story: money pours into the funds and categories that performed best in the recent past. In 2017, small-cap and mid-cap funds saw record inflows — right after a three-year bull run in those categories. By 2018–2019, those same categories had corrected severely.
In 2023–2024, as defence, PSU, and infrastructure funds put up dazzling returns, retail investors crowded in. The recency of those gains made the future feel obvious. It wasn’t. Rotation, mean reversion, and valuation reality always eventually reassert themselves.
| What The Brain Says | What Data Actually Shows |
|---|---|
| “This fund gave 55% last year, it must be exceptional” | Top-quartile funds consistently fail to repeat in the next 3 years |
| “This sector is on fire. The trend will continue.” | Sector rotations mean today’s winner is frequently next cycle’s underperformer |
| “The market has been rising for 18 months — it knows something” | Valuations after 18-month bull runs are typically elevated, increasing risk |
| “The market has crashed — it must mean something is fundamentally broken” | Market crashes historically precede strong recoveries in 12–24 months |
| “Everyone is exiting this fund, so something must be wrong” | Mass outflows often mark the point closest to the bottom |
How recency bias distorts your reading of market signals
The Star Rating Trap
Fund aggregator websites like Value Research and Morningstar give star ratings to mutual funds. Five stars. The dream. And predictably, five-star funds receive the most inflows — because those stars are awarded almost entirely based on recent past performance. Investors use backward-looking ratings to make forward-looking decisions. That’s like driving on the highway using only your rear-view mirror and wondering why you keep hitting things.
Research consistently shows that five-star rated funds at time of investment frequently underperform three-star funds over the subsequent three to five years. This is called mean reversion — extraordinary returns tend to moderate back toward long-term averages. Recency bias makes investors chase the extraordinary and be surprised by the ordinary every single time.
How Recency Bias Stops SIPs at Exactly the Wrong Moment
Here’s the perfect crime that recency bias commits against SIP investors: it makes you stop your SIP at the one moment it should never be stopped.
When markets fall 30%, the recent experience is relentlessly negative. Every statement shows lower numbers. Every financial news channel has a man looking worried while pointing at red numbers. Every WhatsApp group forward says “experts predict further crash.” The recent trend is clearly: down. And so the brain, faithfully applying recency bias, concludes: more of the same. It will keep going down. Stop the SIP. Preserve cash.
But here’s what your SIP was actually doing during that crash: it was buying more units at dramatically lower prices. A fund at ₹50 NAV was buying you twice as many units as the same fund at ₹100 NAV. Stopping the SIP didn’t protect you. It robbed you of the cheapest units you’d ever have the opportunity to buy.
SIP is specifically designed to benefit from market crashes through rupee cost averaging. When markets fall, your fixed monthly SIP amount buys more units. When markets recover, those extra units multiply your gains. A crash isn’t a threat to your SIP. It is the SIP’s moment of maximum usefulness. Stopping a SIP in a crash is like turning off your air conditioner during a heat wave because electricity bills are feeling painful.
Herd Behavior: The Most Powerful Social Force in Financial History
Let’s talk about Ramesh. Ramesh is a perfectly rational person. He reads well, thinks clearly, and makes sensible decisions at work and at home. But Ramesh has a problem. In January 2024, three of his five close friends start talking enthusiastically about a particular small-cap fund that their mutual fund distributor recommended. It’s returned 75% in the last two years. Office lunches buzz with it. One friend’s wife is in it. The distributor keeps calling.
Ramesh does not invest in this fund based on his own research, his risk profile, his time horizon, or his financial goals. He invests because everyone else seems to be investing. This is herd behavior. And Ramesh is not irrational. He is deeply, evolutionarily human.
Why Herding Feels Rational (Even When It Isn’t)
Social proof is one of the most powerful cognitive shortcuts the human brain uses. When we observe many people making the same decision, our brain interprets it as evidence. “They can’t all be wrong. There must be something I’m missing. If I don’t do what they’re doing, I might be the foolish one who misses out.”
This worked brilliantly when humans lived in groups. If everyone in the village ate from the same berry bush, you could reasonably conclude the berries were safe. Information flowed through social observation. Copying the crowd was often optimal.
In financial markets, it’s catastrophic. Because unlike berries, a financial asset’s attractiveness decreases as more people crowd into it. Prices rise. Valuations stretch. Risk increases. The crowd creates the problem it appeared to be solving.
Remember those “grey market premium” conversations during 2021? IPOs were being subscribed 100x, 200x. “Applied for ₹2 lakh worth, will get ₹10,000 allotment” became a ritual complaint. People who had never invested a rupee in their lives were applying for IPOs because everyone was. Several of those 2021 IPOs that listed at premiums of 50–100% were trading below their issue price a year later. The herd knew one thing: other people were excited. The herd did not know: how to value a company.
WhatsApp University: The World’s Largest Unregulated Financial Advice Platform
No article on Indian investor herd behavior is complete without acknowledging the magnificent, chaotic, gloriously unreliable institution of WhatsApp financial advice.
The typical WhatsApp investing tip travels like this: a financial influencer or distributor creates a forward about a “must-buy” fund or stock. It circulates through 47 family and friend groups. By the time it reaches your mother, it has the authority of established wisdom and the urgency of breaking news. Your mother forwards it with the caption: “Beta, share karo, bahut useful hai.” You share it. The cycle continues.
The particular danger of WhatsApp advice is that it combines two powerful ingredients: social trust (it came from someone you know and respect) and social proof (many people in your network are sharing it). Both bypass critical thinking. The brain doesn’t subject advice from trusted sources to the same skepticism it applies to strangers. And advice endorsed by a crowd feels validated by consensus.
| Source of Advice | Emotional Weight | What It’s Usually Based On | Actual Usefulness |
|---|---|---|---|
| SEBI-registered financial planner | Low (boring, data-driven) | Your goals, risk profile, time horizon | Very high |
| WhatsApp group forward | High (social trust + urgency) | Recent performance, someone’s gut | Usually negligible or negative |
| Financial YouTuber | Medium-high (parasocial trust) | Whatever generates views this month | Variable, often recency-biased |
| Relative who “doubled money” in 2 years | Very high (narrative + envy) | A lucky outcome in a bull market | Close to zero |
| News headlines (“Market at all-time high!”) | High (urgency framing) | Yesterday’s price movement | Counterproductive |
Not all investing advice is equal — but our brain treats high-emotional-weight sources as most credible
Financial Influencers and the Algorithmic Amplification of Herding
The rise of financial content creators on YouTube, Instagram, and Twitter/X has added rocket fuel to herd behavior. The incentive structures of social media platforms reward content that generates engagement — and nothing generates engagement in personal finance like hot tips, dramatic predictions, and fund recommendations with compelling back-tested charts.
An influencer who recommends boring, diversified, patient investing in index funds gets 3,000 views. An influencer who says “This small-cap fund can 10X in 5 years — here’s why” gets 300,000 views. The platforms reward the dramatic over the measured. The audience self-selects toward excitement. And the herding intensifies.
This is not a criticism of all financial content creators — many do excellent, honest work. It’s a structural observation: the attention economy is allergic to nuance and long time horizons. “Stay in your SIP, be patient, diversify, and stop checking your portfolio every day” is the correct advice for 95% of retail investors. It is also profoundly unwatchable.
The Emotional Cycle That Every Investor Rides (Usually in the Wrong Direction)
Westcore Funds developed the classic “Investor Emotion Cycle” and it maps investor psychology to market cycles with uncomfortable accuracy. Every investor rides this cycle. The question is not whether you ride it, but how far down before you get off and how much damage you do to your portfolio in the process.
(Most buy here)
(Most sell here)
(Best time to buy)
The tragic comedy of retail investing is that most people arrive at the party at Euphoria — when the market is already priced for perfection — and leave in a panic at or near the bottom, when assets are at their most attractive. The emotions feel completely justified in the moment. They lead to decisions that are consistently, reliably, expensively wrong.
Think of it like cricket. Retail investors tend to join the crowd in the stands when the team is 300/2 after 40 overs — everything looks brilliant, it’s exciting, they want to be part of it. They leave when the team is 310/8 in the 48th over — it looks dire, people are heading for the exits, why sit through this? The problem is that the last 2 overs sometimes produce 40 runs. And those who stayed — who invested in the crash — get the full innings.
Why Market Corrections Feel Personal (Even Though They’re Not)
Here is a psychologically rich phenomenon that doesn’t get enough attention: investors experience portfolio losses as personal failures, not market events.
When your equity mutual fund falls 25% in a market correction, nothing has gone wrong with your decision. A diversified equity portfolio will correct in a market downturn. That’s not a flaw — it’s how the asset class works. The long-term returns of equity are compensation for tolerating these corrections.
But the brain doesn’t file it under “asset class behavior.” It files it under “I made a mistake.” The emotional experience of a portfolio loss activates the same neural circuits as a personal failure. Which is why investors start googling “is this fund safe” and “should I switch to FD” — questions that would make no sense if they viewed the loss as a weather event (which is much closer to what it actually is) rather than a personal error.
Your SIP journey is like a classic Bollywood film. The first half is all romance, music, and optimism. The intermission (market correction) is dark, painful, and seems to suggest the hero might lose. The second half has struggles, self-doubt, and a few more crises. But then — and this is guaranteed in Bollywood and historically consistent in equity markets — the ending is triumphant. The mistake most investors make is leaving at intermission and complaining they wasted money on a bad film.
Signs You Are Investing Emotionally (A Checklist for the Brave)
Read these and be honest with yourself. This is a judgment-free zone. (Mostly.)
- You started a SIP after a friend mentioned their fund’s amazing returns at a party
- You check your portfolio value more than once a day
- You stopped a SIP “temporarily” during a market fall — and never restarted it
- You switched funds because the 1-year return chart looked better elsewhere
- You have invested in a fund whose investment objective you cannot explain in one sentence
- You panic-sold a fund that subsequently recovered fully within 12 months
- Your fund selection was influenced by a WhatsApp forward from a relative
- You feel relieved when you exit a fund, regardless of whether you made money
- You have more than 12 active mutual fund schemes
- You invested in an IPO primarily because everyone in your office was applying
- You have delayed starting an SIP because you were “waiting for the right time”
- Market news changes your mood for the day
If you checked more than four of these, this article was written for you. Also: you are in excellent company. These behaviors describe the majority of Indian retail investors. The purpose of naming them is not to induce shame — it’s to make the invisible visible. Biases you can name are biases you can start to manage.
Myth vs. Reality: The Most Damaging Investing Beliefs
I should wait for the market to “settle down” before investing.
Markets never fully settle. “Waiting for stability” has historically meant waiting while prices rise. Time in market beats timing the market.
A fund that returned 60% last year is a better fund than one that returned 18%.
A 60% return often means high concentration, high risk, or favorable market timing. A consistent 18% over 10 years builds far more wealth with far less stress.
If I invest during a crash and it falls further, I’ve made a mistake.
If you’re buying a fundamentally sound asset at a lower price than before, you’ve made a rational decision. What happens next in the short term doesn’t retroactively make the decision wrong.
My relative made 3X in small-cap funds. I should do the same.
Your relative also may not have disclosed the three other funds that lost 50%. Or their time horizon. Or their recovery SIPs. A vivid success story is not a replicable strategy.
Switching to a better-performing fund regularly is smart portfolio management.
Frequent switching locks in tax liabilities, resets your investment horizon, incurs exit loads, and guarantees you perpetually chase yesterday’s performance. It is the opposite of smart.
How Smart Investors Think Differently
The investors who build real long-term wealth in mutual funds are not smarter than you. They don’t have better information. They don’t have a secret formula. What they have is a fundamentally different relationship with their own psychology. Here’s what that looks like in practice:
They Have a Written Investment Plan
Disciplined investors write down their financial goals, investment amounts, time horizons, and asset allocation before the market does anything. This Investment Policy Statement (even if it’s a note on their phone) serves as an anchor when emotions run high. “I have written that I will not change my SIP regardless of short-term market movements.” That sentence is worth more than any financial analysis in a crash.
They Treat Market Falls as Sales Events
Imagine your favourite grocery store announcing a 30% sale on all products this week. Would you stop buying groceries? Or would you stock up? The investor who says “I’m stopping my SIP because the market fell 30%” is the person who stops buying groceries because they went on sale. The framing is entirely wrong. Lower NAV = more units for the same money = better future outcome. The mathematics are not subtle.
They Do Not Check Portfolios Daily
Multiple studies have shown that the more frequently investors check their portfolio, the worse their returns — because frequent checking leads to more decisions, and more decisions under emotional conditions leads to more bad decisions. The ideal checking frequency for a long-term SIP investor is probably quarterly. The actual average is approximately hourly in a market correction.
They Distinguish Between Price and Value
Price is what you pay. Value is what you get. In a market crash, the price of your fund units falls. The underlying value of the companies in the portfolio — their future earnings potential, their assets, their competitive positions — doesn’t fall by the same amount (and often doesn’t fall at all, if they’re fundamentally sound businesses). Confusing temporary price decline with permanent value destruction is one of the most expensive errors in investing.
They Automate Everything They Can
The best investing decision you can make is the one that removes future decisions. An automated SIP on the 1st of every month, regardless of market conditions, regardless of what your cousin says, regardless of what Sensex did yesterday — that is behavioral finance engineering applied to your own life. Make the good decision once. Let automation execute it forever. Never give your emotional brain another chance to override it.
The Fix: A 6-Step Emotional Discipline Framework
Define: your goals, your monthly SIP amount, your asset allocation, and one rule — “I will not change my SIP or switch funds based on market performance.” Write it down. Review it when you’re tempted to act emotionally.
Every month you have to manually trigger your investment is a month your emotional brain gets a chance to veto it. Take that veto away. SIP auto-debit is not just convenience — it’s psychological protection.
Decide in advance: if the market falls more than 15%, I will not check my portfolio for 30 days. This sounds extreme. It is also exactly what the evidence suggests you should do. What you don’t see, you can’t react to impulsively.
Any fund evaluation that uses a time window shorter than 3 years is feeding your recency bias. Commit to evaluating fund performance only over full market cycles — covering both bull and bear periods. Short-term comparisons are noise dressed up as signal.
Create a personal rule: no investment decision will be triggered by a WhatsApp forward, an Instagram reel, or a relative’s recommendation. Information from these sources is welcome. Decisions require a 7-day waiting period and independent verification from SEBI-registered advisors or primary data.
When markets fall and anxiety demands action, channel that energy into productive non-portfolio activity: review your emergency fund, check that your insurance coverage is adequate, read about the underlying businesses in your fund’s portfolio. These are genuinely useful actions that don’t involve triggering your regret aversion or herd instincts.
The Long Game: Why Boring Wins
The most successful retail mutual fund investors over 20-year time horizons share a striking characteristic: their strategy is boring. Diversified equity funds or index funds, monthly SIP, automatic increment every year, reviewed quarterly. No pivots. No hot tips. No fund-hopping. No stopping during crashes. No doubling up in bull markets.
This bores people at dinner parties. It does not generate WhatsApp forwards. Financial influencers will not build a following around it. It will never be the most exciting thing happening in your portfolio on any given day.
It will, however, very reliably build significant wealth over time. And in a market full of people chasing excitement, consistency is the ultimate competitive advantage.
The investor who stayed invested through every crash between 2008 and 2026 — 2008 global financial crisis, 2011 European debt scare, 2015 China crash, 2018 IL&FS crisis, 2020 Covid crash, 2022 rate hike correction — didn’t just survive. They compounded through all of it. Every crash that felt like “this time it’s different” was, in fact, not different. Markets recovered. Disciplined investors prospered. The herd that fled returned later and bought higher.
The most powerful investing strategy is also the simplest: invest regularly, stay invested, and get out of your own way.
Final Thoughts: The Battle Is Within
Regret aversion, recency bias, and herd behavior are not character flaws. They are the operating system your brain came installed with — optimized for a world very different from today’s financial markets. You cannot delete these instincts. But you can build systems that prevent them from having direct control over your portfolio.
The market will correct again. Your phone will buzz with panic. Your colleague will either brag about gains or lament losses in a way that makes you question everything. WhatsApp will forward some urgent tip about something that’s definitely going to 10X.
And when all of that happens, the investor who wins is the one who has already made their decisions — in writing, in calm, in advance — and left no room for their own amygdala to override them.
Invest like you’re bored. Because over 20 years, boredom compounds magnificently.
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