There is a game economists use to study fairness. One player receives a sum of money and proposes how to split it with a stranger. The stranger can either accept the offer or reject it — and if they reject it, neither player gets anything.
The rational choice is obvious. Any offer above zero is better than nothing. You should always accept.
And yet, people don’t. Consistently, across cultures and continents, people reject splits they deem unfair — forfeiting real money to punish a stranger for the crime of proposing an unequal deal. Logic says take the money. The brain says burn it down.
This is where most conversations about bad financial decisions begin and end: we’re irrational. But that’s not quite the right frame. The more interesting question is why — and what the answer means for anyone trying to build wealth without their own mind working against them.
Money Is a Drug. Literally.
Canonical economics treats money as a means to an end. You want money because it buys things, and it’s the things — the house, the vacation, the security — that you actually care about. Money is just the instrument.
Neuroscience disagrees.
Brain scans show that money activates the same dopaminergic reward pathways as food, drugs, beautiful faces, and sports cars. We don’t just like what money can buy. We like money itself, at a primal level that precedes and bypasses rational calculation. The brain treats a cash gain something like a hit of dopamine — which is why Jason Zweig’s observation lands so well: “When you get a ‘gut feeling’ that an investment has gone sour, you might not be imagining. The spindle cells in your insula may be firing in sync with your churning stomach.”
This reframes a question we often ask about the ultra-wealthy — why does someone with more money than they could spend in ten lifetimes lie, cheat, and scheme to accumulate more? The easy answer is greed or ego. The neurological answer is more unsettling: the brain appears wired to pursue money directly, independently of what it produces, and is never fully satisfied in that pursuit. It isn’t a character flaw. It’s a hardware feature.
The Buddha Saw This Coming
Around 500 BC — long before fMRI machines and neurological studies — a young man named Siddhartha Gautama sat down under a tree and figured out something fundamental about the human mind.
Born into royalty, he had inherited a kingdom by the age of 29. He had achieved, early in life, what most people spend their entire lives chasing. And he was miserable. Looking around, he saw that this misery wasn’t unique to him — the poor longed for wealth, the wealthy longed for more wealth, the young for vitality, the old for their youth. Rich or poor, young or old, dissatisfaction was the common thread.
His great insight — the one that became the foundation of Buddhism — was that human suffering was not the result of divine displeasure or bad luck. It was a product of the mind’s inability to be satisfied. Suffering, he concluded, arose when our ceaseless craving met the inevitable impermanence of everything we craved.
Twenty-five centuries later, neuroscience has caught up. The Buddha was right, and he was right about money in particular.
The Mirage of Getting What You Want
Here is the cruelest trick the brain plays: anticipating a reward is more pleasurable than receiving it.
Imagined rewards have no ceiling. They come with no tax bill, no complications, no deflating reality. When you fantasize about what you’d do with lottery winnings, your brain processes that as something close to actually winning. The dopamine flows, the pleasure is real, the ceiling is wherever your imagination stops. No wonder we spend so much time building castles in the sky.
Then the money arrives — and something strange happens. As Zweig puts it: “By the time you pocket the money, the thrill of greed has faded into something that resembles a neurological yawn — even though you got the gains you wanted. Making money feels good, all right; it just doesn’t feel as good as expecting to make money.”
Psychologists call the resulting cycle the hedonic treadmill. You run hard to reach a new level of financial comfort. You arrive. You adjust. The new level becomes the baseline. The treadmill starts again.
This is the mechanism behind keeping up with the Joneses — not a social phenomenon but a neurological one. The brain doesn’t measure wellbeing in absolute terms. It measures it comparatively, relative to what we had before and relative to what those around us have. Which means that in a society structured around visible displays of wealth, the treadmill never stops, and the finish line is always one purchase ahead of you.
The Swiss Know Something We’ve Forgotten
This is not, it turns out, a universal feature of human civilization. It is a feature of a particular attitude toward money — one that is cultural rather than biological.
Switzerland is one of the wealthiest countries on earth, and it operates on a philosophy that is almost the inverse of the American model. Where American culture says “if you’ve got it, flaunt it,” Swiss culture says “if you’ve got it, hide it” — wealth is private, understatement is a social virtue, and conspicuous consumption is considered bad form. The result is a country where the hedonic treadmill runs at a significantly lower speed, where envy is less systematically provoked, and where the comparative measurement of financial success is not the dominant organizing principle of daily life.
This matters, because it demonstrates something important: we are not condemned to our worst financial impulses. They are tendencies, not destiny. The brain is a biased instrument, but it is also a flexible one.
Why You Are Neurologically Wired to Buy High and Sell Low
The Ancient Greeks identified two forces that drive human behavior: pleasure-seeking and pain avoidance. In investing, these translate directly into bull and bear markets — and into a problem that should terrify anyone who has ever made a financial decision.
When markets rise and wealth is accumulating, the brain’s reward system — running from the midbrain through the limbic system into the neocortex, carried by dopaminergic pathways — lights up. As Dr. Richard Peterson explains, activating this system produces “increased risk-taking, increased impulsivity, and greater physical arousal.” In plain terms: a bull market makes you feel invincible, and that feeling makes you stupid. You take on more risk. You pay more for assets. You stop asking whether the price is right, because the dopamine is already flowing.
Bear markets work in reverse. Fear activates the pain-avoidance system, making investors “timid, protective, fearful and risk-averse.” Assets go on sale. Risk is genuinely low. And the neurological response is to freeze, sell, or flee.
The result is a systematic tendency to do the exact opposite of the first rule of investing: buy high, sell low. This is not a failure of knowledge. Most investors know the rule. It is a failure of neurology. The brain that served our ancestors well — responding to immediate threats and rewards, taking what was available when it was available — is profoundly mismatched to the task of allocating capital across decades.
Howard Marks calls this the “perversity of risk”: risk doesn’t announce itself. It builds quietly during periods of prosperity, when everyone feels safe, when nobody is demanding caution, when the prices of risk assets have been bid up by investors too intoxicated by their own gains to be discerning. Then it materializes, suddenly, in the crash — and everyone decides that now is the time to be careful.
Know Thyself — and Then Know the Market
The Ancient Greeks had another piece of advice alongside their model of pleasure and pain: know thyself. It was carved into the temple at Delphi. It was Socrates’ core instruction. And in the context of investing, it may be the only edge that is both genuinely available and genuinely durable.
Animals use their brains to read the world. Only humans can turn that faculty inward — to observe the observer, to catch the bias in the act of biasing. Your brain is, as the neuroscientists put it, beautiful but out of place. It was formed for a different environment, optimized for a different set of problems. Your ability to build and sustain wealth is predicated on understanding this mismatch.
You will feel the pull toward the investment that has already risen. You will feel the revulsion toward the asset that has already fallen. You will want to lock in winnings when you should hold, and cut losses when you should buy. These are not moral failures. They are neurological outputs from a system that wasn’t designed for capital markets.
The first step isn’t to suppress those impulses — that doesn’t work. It’s to recognize them for what they are: signals from a brain optimized for a world that no longer exists, dressed up as financial instinct.
The gut feeling is real. The spindle cells are firing. The question is what you decide to do about it — and that is where consciousness has its say.
Source : The Behavioral Investor: How psychology shapes wealth, risk, and investment decisions by Daniel Crosby
Goodreads : https://www.goodreads.com/book/show/36960014-the-behavioral-investor
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