What Is Reflexivity? Soros's Theory of Markets
Reflexivity is the idea that investor perception does not simply observe market fundamentals from the outside — it actively feeds back into them. George Soros formalised the concept, drawing on the philosophy of Karl Popper, as a challenge to the assumption underlying most economic models: that prices converge toward some independently existing "true value," with participants merely trying to estimate it more accurately than one another.
Reflexivity proposes something different. Participants' biased perceptions shape their actions. Those actions can alter the underlying fundamentals themselves — not just the price assigned to them. A rising share price, for instance, can make it cheaper for a company to raise capital, which can genuinely improve its balance sheet, which can then justify a higher share price. Perception and reality are not cleanly separable; each can drive the other in a loop.
This matters because it breaks the standard assumption of a stable target that prices are trying to find. If the act of pricing something can change what it's worth, equilibrium is not a resting point the market settles into — it's a temporary state that the market's own activity can undermine.
Soros distinguished this from ordinary supply-and-demand dynamics by emphasising two functions operating simultaneously: a cognitive function, where participants try to understand the market, and a manipulative (or participating) function, where their understanding, and their actions based on it, change the market they are trying to understand. In conventional theory only the first function is assumed to matter. Reflexivity treats both as continuously active and intertwined.
The practical implication is a degree of humility about prediction. If fundamentals and perception can drive each other, a model that treats fundamentals as fixed and perception as the only variable to solve for is missing half the mechanism — and may be most wrong exactly when a feedback loop between the two is running hardest.
BA (Hons) Business Management | MSc Candidate (Systems Thinking)
Trading Beyond Charts
Comments
New comment
So basically, the price of something is what I am willing to pay for it, just as much as it is what the vendor is willing to sell at.
To Darren
That's part of it — price is always a meeting point between buyer and seller. Reflexivity adds something more specific: the idea that the act of pricing something can change what it's worth.
Think of a restaurant that gets a few good reviews. People see the buzz and book a table. Now the place is full every night. That atmosphere makes the experience better — the crowd is part of the appeal. The perception of quality created actual quality. The reviews didn't just predict success — they helped cause it.
Markets work the same way. Take a company whose share price is rising. Investors see momentum and buy in. The higher price lets the company raise capital cheaply. That strengthens the balance sheet, which justifies the higher price. Perception didn't just reflect value. It created it.
The loop runs both ways, and that's what Soros was getting at. Thanks for reading, Darren."
TL;DR: Reflexivity is the idea that investor perception does not simply observe market fundamentals — it actively feeds back into them
TL;DR: Reflexivity is the idea that investor perception does not simply observe market fundamentals — it actively feeds back into them. Participants' biased perceptions shape their actions, and those actions can alter the underlying fundamentals themselves. A rising share price can make it cheaper for a company to raise capital, which strengthens its balance sheet, which justifies the higher price. Perception and reality are not cleanly separable. This breaks the standard assumption of a stable target that prices are trying to find. If the act of pricing something can change what it is worth, equilibrium is not a resting point — it is a temporary state that the market's own activity can undermine. The practical implication is humility about prediction: if fundamentals and perception can drive each other, a model that treats fundamentals as fixed is missing half the mechanism — and may be most wrong exactly when a feedback loop is running hardest.
Regards,
Russell Larke
BA (Hons) Business Management | MSc Candidate (Systems Thinking)
Trading Beyond Charts