What is Reflexivity theory in relation to stocks and here’s how it made George Soros rich

Nick Sundich Nick Sundich, March 8, 2024

If you have ever thought your stocks is influenced more by perceptions and actions of investors rather than fundamentals, that is reflexivity theory. Yes, you’re not alone in thinking that – there’s an official framework for it. Reflexivity theory was named by one of the most noteworthy investors of all time, who made a fortune from advancing on it, none other than George Soros. We outline what this theory is, and how it made George Soros rich.


What is reflexivity theory?

Reflexivity theory, as proposed by George Soros, says that the valuation of stock markets is influenced by the perceptions and actions of investors, which in turn affect those very markets in a feedback loop.

According to reflexivity theory, the perceptions and actions of individuals can greatly impact market behaviour, creating a self-reinforcing cycle. This means that even if there is no substantial change in fundamental values, investor sentiment and actions can drive stock prices up or down. This highlights the role of psychology and human behaviour in financial markets, as emotions such as fear and greed can heavily influence decision making.

The theory challenges the traditional notion of markets being purely driven by fundamentals. In essence, the theory suggests that investor biases and actions can lead to prices diverging from their underlying value, creating self-reinforcing trends until a point of correction. While debated, aspects of reflexivity theory can be observed in reality, especially in scenarios leading up to financial bubbles and crashes, where investor sentiment overwhelmingly drives market movements, often detached from fundamental valuations.


What’s the big deal about reflexivity theory?

The theory of reflexivity has important implications for investors and policymakers alike. Firstly, it challenges the idea of efficient markets, where prices fully reflect all available information. Instead, it suggests that market movements are not always rational and can be influenced by external factors such as media coverage and social sentiment. This highlights the importance of understanding market psychology and being aware of potential biases and irrational behaviour.

Furthermore, reflexivity theory also highlights the dangers of herd mentality in financial markets. When a large number of investors act based on shared beliefs and emotions, it can create volatile and unstable market conditions. This was evident in the dot-com bubble in the late 1990s, where investor excitement and FOMO (fear of missing out) led to overvalued stock prices, ultimately resulting in a crash. And there have been plenty of other smaller bubbles as well.

On the other hand, reflexivity theory also offers opportunities for investors to capitalize on market inefficiencies and mis-pricings caused by irrational behaviour. By understanding and anticipating market trends driven by investor sentiment, investors can make profitable investment decisions.


How reflexivity theory made George Soros rich

George Soros’ bet against the British Pound in 1992, often referred to as “breaking the Bank of England,” was a strategic move grounded in reflexivity theory. The British government at the time was obligated to keep the pound within a certain range against the Deutsche Mark as part of the European Exchange Rate Mechanism (ERM). However, Soros believed that the British Pound was overvalued and that the UK’s high inflation rates and low interest rates compared to Germany’s made it unsustainable for the UK to maintain this fixed rate.

Acting on his belief, Soros short-sold more than $10 billion worth of pounds. When the UK eventually withdrew from the ERM and allowed the pound to float freely, its value plummeted against the mark, confirming Soros’ prediction. This move netted Soros a profit reputed to exceed $1 billion, exemplifying reflexivity theory’s application where the traders’ perceptions, influenced by Soros’ actions, significantly impacted the fundamentals, leading to a self-reinforcing phenomenon.


Rising tides….

Soros’ success in the financial market is not solely attributed to his understanding of reflexivity theory, but also to his ability to spot and capitalize on trends. He famously referred to it as “riding the tide,” emphasizing that traders should not try to predict the market, but instead take advantage of existing trends. This approach aligns well with reflexivity theory as Soros understood that his actions and the perceptions they created could ultimately shape market values in the direction he wanted.

Furthermore, Soros’ success can also be attributed to his ability to adapt and change his strategies when necessary. He understood that market conditions are constantly evolving, and traders must be flexible enough to adjust their approaches accordingly. This mindset allowed him to stay ahead of the curve and capitalize on emerging market trends.



Overall, reflexivity theory brings attention to the interconnectedness of markets and human behaviour, highlighting the need for a more holistic approach to understanding and analysing financial markets. It reminds us that financial markets are not solely driven by numbers and data, but also by the thoughts, emotions, and actions of individuals. As such, reflexivity theory provides valuable insights into market dynamics and can aid in making more informed investment decisions.

And so the next time you make an investment decision or observe market movements, remember the influence of reflexivity theory and its implications on financial markets. Investors should keep a close eye on market psychology and always question if there may be more than meets the eye when it comes to stock valuations.


What are the Best ASX Stocks to invest in right now?

Check our buy/sell tips


Blog Categories

Get Our Top 5 ASX Stocks for FY25

Recent Posts

best stocks

5 Best Stocks Under $100 To Buy Now

If you’re new to investing and don’t have a lot of money to start with, will you be missing out…

Telix Pharmaceuticals on the Nasdaq

Telix Pharmaceuticals (ASX:TLX): Is there further upside to be excited for in FY25?

What would you have thought if you were told 5 years ago you would see Telix Pharmaceuticals as a successful…

like for like sales

Like for like sales: What does it mean and why do retailers use that creative term?

ASX retailers often use ‘like for like’ sales in addition to total sales. It is most common for companies that…