Soros's theory that market prices and economic fundamentals mutually influence each other through two-way feedback loops — creating self-reinforcing dynamics that cause cycles to overshoot equilibrium in both directions.
“Markets are always wrong in the sense that they operate with a prevailing bias, but they usually correct themselves. The question is not whether they are right or wrong, but in which direction they deviate.”
— George Soros
Deeper Explanation
Reflexivity is George Soros's central theoretical contribution to understanding market dynamics. It directly contradicts the efficient markets hypothesis, which holds that prices passively reflect information about economic fundamentals. Soros argues that the relationship runs in both directions: prices influence the thinking and behaviour of market participants, and that thinking and behaviour influence the economic fundamentals that prices are supposed to be measuring. The mechanism operates through two functions. The cognitive function describes how market prices influence participants' perception of reality: rising asset prices create narratives of success, attract institutional attention, generate media coverage, and make further investment seem rational. The price change literally changes what people believe to be true about the underlying economic reality. The participative function describes how participants' changed beliefs and subsequent actions alter the economic reality itself: when rising stock prices attract capital investment in a sector, that capital investment may actually improve the sector's fundamentals, temporarily vindicating the initial optimism. This two-way causality creates boom-bust cycles that are self-reinforcing rather than self-correcting. In the boom phase, rising prices improve perceptions, which improve fundamentals (through capital inflows, improved management access to capital, lower borrowing costs for the favoured companies), which justify further price increases. The loop runs until it cannot run further — typically when credit conditions tighten, when the fundamental improvement fails to materialise at the pace the price implies, or when a shock breaks the narrative. The bust phase is the loop running in reverse with equal force. The investment implication of reflexivity is that market trends can sustain themselves longer and reach more extreme levels than any fundamental analysis would predict — and that the reversal, when it comes, is equally extreme. Soros's trading approach involves identifying self-reinforcing processes early, participating in them while they run, and reversing direction as they approach exhaustion. The difficult skill is distinguishing reflexive trends from fundamental trends, and identifying the moment of transition between acceleration and exhaustion.
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