Or: Why Your Brain Is a Terrible Stock Picker
Let’s talk about how you think. Not what you think — but how your brain actually gets from Point A to Point B when it’s trying to figure something out. Because here’s the thing: the way you reason through problems isn’t random. It follows patterns — called inference vectors — and understanding them might be the most important financial lesson you never got in school.
Don’t worry. No one did.
Your Brain Has a GPS. It’s Just Frequently Wrong.
An inference vector is basically a direction your brain travels when it’s connecting evidence to a conclusion. Think of it like a GPS route — except sometimes your brain’s GPS takes you through a neighborhood that looks fine on the surface but quietly leads you off a cliff.
There are four main routes your brain uses:
Deductive reasoning is the confident one. It says: “All ice cream trucks play music. That truck is playing music. Therefore — ice cream!” In finance, it sounds like: “Rising interest rates hurt bond prices. Rates are rising. My bonds are going to hurt.” Clean. Logical. Works great — until one of your starting assumptions is wrong.
Inductive reasoning is the pattern guy. It says: “Every time I wore my lucky socks, the market went up. I should probably wear them more.” Okay, that’s a bad example. A better one: “Small company stocks have outperformed in eight of the last ten recoveries — they probably will again.” Useful — but always one weird exception away from being completely wrong.
Abductive reasoning is the detective. It says: “The market just dropped 500 points for no obvious reason. Best guess? Something broke somewhere in the credit markets.” This is the reasoning your brain uses when it doesn’t have all the facts but still needs to act. It’s the fastest vector. It’s also the one most likely to get you in trouble if your “best guess” is actually just panic wearing a trench coat.
Analogical reasoning is the historian. It says: “This situation reminds me of 2008. Or maybe 2000. Let me think about what happened then.” Experience makes this one sharper. Which is exactly why your newly licensed cousin — bless their heart — doesn’t have it yet.
The Part Where It Gets Real
Here’s where inference vectors stop being a cool vocabulary word and start costing people actual money.
Most people — smart, educated, perfectly capable people — look at their finances and think: “I’ve got this. How hard can it be?” And their brain, being the helpful little inference machine it is, immediately starts connecting dots. They read some articles. They watch some YouTube videos. They talk to their brother-in-law who “did really well” in 2021. And before long, their abductive reasoning has generated a very confident conclusion from very incomplete information.
This is called overconfidence bias. Researchers have studied it for decades. It is the single most documented error in investor behavior. And the sneaky part? The less you know about a subject, the more confident you tend to feel about it. (Yes, that’s real. It’s called the Dunning-Kruger effect, and it has absolutely destroyed more retirement accounts than any bear market ever has.)
Meanwhile, a seasoned financial advisor has spent decades building something your YouTube binge cannot replicate: a calibrated, experience-tested reasoning architecture. They’ve seen what happens when you ignore sequence-of-returns risk. They’ve watched portfolios collapse under emotional decision-making in real time. They know the difference between two things moving together (correlation) and one thing actually causing the other (causation) — a distinction the human brain, even in fully grown adults, consistently gets wrong.
In fact, scientists have studied how humans learn to separate correlation from causation, and here’s the humbling part: it takes from infancy all the way through your mid-twenties before your brain is even fully wired for it. And even then, under emotional pressure — like watching your portfolio drop 30% in a month — your prefrontal cortex (the logical part) essentially hands the keys to your amygdala (the panic part). The amygdala is a terrible portfolio manager.
So What Do You Do About It?
You don’t need to become a cognitive scientist. You just need to recognize that financial reasoning is a skill — one that takes years of deliberate, structured practice to build — and that the cost of not having it is very, very real.
The best investors in the world don’t succeed because they’re smarter. They succeed because they have better reasoning systems, better behavioral guardrails, and — almost always — someone in their corner who has seen this movie before.
Ready to stop guessing and start reasoning?
Schedule a complimentary conversation with Vaughn Woods Financial Group. We’ve spent four decades building the kind of reasoning architecture this article describes — and we’d love to put it to work for you.
It costs nothing to talk. It may cost quite a bit not to.
→ Contact us at vaughnwoods.com
Vaughn L. Woods, CFP®, MBA
Founder and Owner, Vaughn Woods Financial Group, Inc.
2226 Avenida De La Playa
La Jolla, CA 92037
Phone: 858-454-6900
Email: vw@vaughnwoods.com
This article is for general informational purposes only and should not be considered legal, tax, or individualized investment advice. Trustees and families should consult their estate attorney, CPA, and qualified financial professional before acting.
Disclosures
Vaughn Woods, CFP®, MBA is President and Founder of Vaughn Woods Financial Group, Inc., an Investment Advisor Representative of Bolton Global Capital, Inc. Client assets are held in custody through Pershing LLC, a subsidiary of Bank of New York Mellon. This article is for informational purposes only and does not constitute personalized investment or tax advice.
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