Investor Psychology · Decision Making · Markets
What a Quantum Physicist Can Teach You About Managing Money
David Bohm never managed a portfolio. But his insight into how thought distorts perception may be the most useful framework a serious investor can study.
The problem is rarely a lack of intelligence. It is the mind’s tendency to mistake its own model for reality.
Thought builds a model of the world.
The model becomes familiar—and then invisible.
Contrary evidence gets filtered through the model.
The market eventually forces the update.
The Thinker
Who was David Bohm?
Physicist. Philosopher. Student of thought.
One of the 20th century’s most original theoretical physicists, Bohm worked alongside Einstein at Princeton and made foundational contributions to quantum mechanics.
He spent the second half of his career asking a harder question: why do intelligent people—including scientists—consistently fail to update their thinking when the evidence changes?
His answer, developed over decades and published in Thought as a System, was that thought is not a neutral observer of reality. It is an active participant that quietly shapes what we perceive, what we ignore, and what we believe is even worth questioning.
Thought creates our world and then says, “I didn’t do it.”
David Bohm
The Core Idea
Thought is a system—and it has a systemic fault.
Bohm observed that thought does not simply record facts and report them back. Over time, thought builds a model of the world. Then—critically—it forgets that the model is a model. It starts treating the model as reality itself.
This matters everywhere. But it matters most where the stakes are high and feedback is slow—exactly the conditions investors face every day.
Facts and outcomes enter the mind.
Thought organizes them into a working explanation.
The explanation begins to feel like reality itself.
The model stops being visible—and stops being questioned.
Why It Matters to You
Bohm’s framework, applied to markets.
Markets are not simply machines processing data. They are aggregations of human thought—beliefs, narratives, fears, and consensus opinions running at enormous scale. When those thought patterns are coherent with reality, prices reflect it. When they diverge, gaps open—both risks and opportunities.
Bohm identified three specific traits of thought that become dangerous under pressure. Each one has a direct market analogue.
Thought hides its own assumptions.
We stop seeing our beliefs as beliefs. They become “just how things work.” In markets, this is the narrative that feels so obvious no one thinks to question it—until it breaks.
Thought defends its conclusions.
New evidence that contradicts our position gets minimized. Evidence that confirms it gets amplified. This is not weakness—it is how the system is wired. Bohm called it a reflex, not a choice.
Thought mistakes the past for the present.
Many feelings about a position—confidence, discomfort, certainty—are actually recordings from previous experiences, not fresh reads of current conditions.
The Pattern
How Bohm’s fault shows up in a portfolio.
This is not a description of reckless behavior. It is a description of what careful, intelligent people do when thought is operating on autopilot.
A strategy works—and becomes identity.
Early success embeds a framework. After enough time, the framework stops feeling like a strategy and starts feeling like wisdom. Questioning it feels like questioning yourself.
Conditions shift—the model doesn’t.
New data arrives. But because it conflicts with the embedded model, thought finds reasons to discount it. “This is temporary.” “The fundamentals haven’t changed.” “Everyone else is overreacting.”
Delay accumulates into a position.
Each delayed update is a small compounding of risk. The gap between what is and what the model says widens quietly, then suddenly.
Repricing forces the update the mind resisted.
The market does not wait for consensus to feel comfortable. By the time the update feels safe, the opportunity—or the exit—has often narrowed significantly.
Bohm would note: this is not a flaw in any individual. It is a systemic flaw in how thought itself operates. Awareness of it is the first—and most important—step.
The Bohm Move
Seeing thought clearly enough to question it.
Bohm did not believe the solution was to think harder or to find better information. He believed the solution was proprioception—a word borrowed from physiology, meaning awareness of your own position and movement in real time.
Applied to investing, proprioception means being able to observe your own reasoning as it runs, not just the conclusions it produces. It means noticing when a strong feeling of certainty is actually a recording from the past—not a fresh read of the present.
When you feel most confident about a position, is that confidence based on current evidence—or on how long you have held the view?
For any position you hold with strong conviction, ask: What would have to be true today for this to no longer make sense?
If you cannot answer that question easily, Bohm would say your thought has already become the model—and the model has become invisible.
A Second Set of Eyes
A structured challenge to the assumptions you have stopped noticing.
One of the most valuable things an advisor can offer is not a better prediction—it is a structured challenge to the assumptions you have stopped noticing. If you would like to talk through your current positioning with a fresh perspective, we would be glad to have that conversation.
This page is educational in nature and does not constitute investment advice. All investing involves risk, including potential loss of principal.