Behavioral Finance and Wealth Management: Why Your Brain Is Bad at Investing
I just finished reading a book that honestly changed how I think about investing. And I’ve been investing for a while now.
The book is Behavioral Finance and Wealth Management by Michael M. Pompian (2nd edition, Wiley Finance, ISBN 978-1-118-01432-5). It’s a guide to understanding why we make irrational decisions with our money and what we can do about it.
What This Series Is About
Over the next few weeks, I’m going to walk you through this book chapter by chapter. Not in a dry, textbook way. More like “here’s what I learned and why it matters for your wallet.”
The basic idea is simple: your brain is wired to be terrible at investing.
Not because you’re dumb. Because evolution designed your brain for survival, not for stock markets. The same instincts that kept your ancestors alive on the savanna are now causing you to panic-sell during market dips and chase hot stocks at their peak.
What You’ll Learn
Pompian breaks investor mistakes into three big categories:
- Belief perseverance biases - these are the mental shortcuts that make you stick to wrong ideas even when evidence says otherwise
- Information processing biases - these are the ways your brain filters and distorts data before you even realize it
- Emotional biases - these are the feelings that override your logic when money is on the line
We’re talking about things like confirmation bias (only seeing what you want to see), loss aversion (feeling losses twice as hard as gains), overconfidence (thinking you’re smarter than the market), and about 17 more biases that mess with your portfolio.
Why Should You Care?
Here’s the thing. Most investing advice tells you WHAT to do. Buy index funds. Diversify. Dollar cost average. That’s all fine.
But nobody talks about WHY you won’t actually follow that advice. Why you’ll check your portfolio during a crash and sell everything. Why you’ll put too much money into your company’s stock. Why you’ll hold onto a losing investment for years because you can’t admit you were wrong.
That’s what behavioral finance is about. It’s the gap between knowing what to do and actually doing it.
The Plan
I’ll cover each chapter as its own post. Here’s the roadmap:
Part 1 - The Basics:
Part 2 - Belief Perseverance Biases:
- Cognitive Dissonance
- Conservatism Bias
- Confirmation Bias
- Representativeness Bias
- Illusion of Control
- Hindsight Bias
Part 3 - Information Processing Biases:
- Mental Accounting
- Anchoring and Adjustment
- Framing Bias
- Availability Bias
- Self-Attribution Bias
- Outcome Bias
- Recency Bias
Part 4 - Emotional Biases:
- Loss Aversion
- Overconfidence
- Self-Control Bias
- Status Quo Bias
- Endowment Bias
- Regret Aversion
- Affinity Bias
Part 5 - Putting It All Together:
Part 6 - What Type of Investor Are You?
And we’ll wrap it all up with final thoughts.
Who Is This For?
If you invest money in any way, stocks, bonds, ETFs, retirement accounts, this series is for you. You don’t need a finance degree. I’ll keep it simple and practical.
If you’re a financial advisor, this is gold. Understanding your clients’ biases will make you way better at your job.
And if you’re just curious about why humans are so weird with money, you’ll enjoy this too.
Let’s get started tomorrow with Chapter 1: What Is Behavioral Finance?
This is a retelling and review of “Behavioral Finance and Wealth Management” by Michael M. Pompian, 2nd Edition (Wiley, 2012). ISBN: 978-1-118-01432-5. All ideas and concepts belong to the original author.