When Human Greed Inflates Value, It Creates A Bubble To Burst

Posted by Peter Rudin on 10. July 2026 in Essay

Introduction

Gone are the days when economists and other analysts believed that financial markets are efficient, driven purely by human rationality. Behavioural finance has taught us over the past decades that investor psychology, cognitive biases and emotional biases influence decision-making and market movements. This is why market conditions like bubbles, crashes and mispricing arise. Fear, leading to panic selling, and greed, leading to speculative buying, are two of the most common emotional biases that drive market cycles. Even professional investors who understand that fundamental factors drive long-term value remain captive to the fear-and-greed cycle.

A Scientific Approach

Financial markets are important as facilitators of an efficient flow of capital and play a vital role in the functioning of an economy. Understanding people’s financial behaviour in such markets is thus equally important because it can help to detect where, when or how markets gain or fail. Emotions and moods have a strong influence on financial decision-making. When crises occur, popular media and lay people often blame greedy financial decision-makers. At first glance, such blame would appear to make sense because greed is indeed an important economic motive related to a variety of economic behaviours. However, clearly identifying the effect of greed is difficult to do based on historical data. For example, various observers claimed that the 2008 financial crisis was driven by low interest rates, liberal mortgage policies driving up housing prices. Some blamed core financial actors such as mortgage advisors to have played a major role, but often incentive systems and institutional environments also contributed to the situation. Financial crises can have many possibly interacting causes and research often struggles to clearly identify separate causes. Given the prominence of greed as a driver of financial market investor’s behaviour in the popular media, researchers analyse these effects empirically using a controlled economic experiment to measure individual greed and classify  investors into markets with greedy individuals and markets with less greedy individuals.

History

The fear-and-greed cycle is a concept that has always been popular on Wall Street. It was popularised by Warren Buffett when he advised that investors should be fearful when others are greedy and greedy when others are fearful. Though it is called the fear-and-greed cycle, it often begins with greed. Investors see opportunities in the market and they start buying. At first, the buying may be justified by certain fundamentals even as the price continues to rise. However, valuations soon detach from fundamentals, yet money keeps pouring in since no one wants to miss out on the next best thing. At this stage, euphoria has set in and a bubble is about to be formed. After a while warning signals arise as investors downplay these warning signals at first until reality dawns on them. Greed then gives way to fear, and everyone starts trying to rush out of the market.  As market participants overreact, selling pressure rises, liquidity dries up, and the market crashes. The dot-com bubble (1999-2000) is a standard example of the fear-and-greed cycle. Investors poured money into the IPOs of internet companies that produced little or no profits, confident that the internet was the next big thing. The initial buying pressure led to rising prices, and everyone wanted a bite, motivated by the belief that the only way was up. During this bull market (1995-2000), the tech-driven NASDAQ went up by 400%. However, the index peaked by March 10, 2000, as the gap between valuations and fundamentals led to anxiety in the market. Yet these funds continued to grow despite the fact that many AI companies were not yet profitable. This was leading to an overvaluation of AI companies reminiscent of the dot-com bubble. A bear market followed, and by October 2002, the index had lost about 78% of its value, as euphoria gave way to fear and panic. Usually, the stock assets settle at a price below the entry price of most of those who followed the crowd and fell to the allure of market euphoria. In other words, the fear-and-greed cycle led many investors to lose money on promises that did not materialise, as they struggled to achieve their financial goals.

The Impact of Emotions

When stocks suffer from losses over a prolonged period, investors begin to panic taking part in a so-called ‘herd behaviour.’ This behaviour often stems from the assumption that others have done their homework, and it is best to follow their lead to avoid any perceived danger. The stock market has historically performed well over longer time horizons and downturns are often part of the greed cycle. Staying patient and focused on one’s long-term strategy can often lead to better outcomes than emotionally reacting to short-term market swings. Unlike fear following a stock market bust, greed generally ramps up during a boom period. The desire to have more money quickly can be overwhelming. For reactionary investors, the combination of fear and greed can result in common sense being cast aside. For example, during the height of the ‘dotcom’ era in the late 1990s, investors eagerly grabbed the opportunity to be part of it and stocks reached an all-time high. The bubble burst in the early 2000s, sending prices on a downward spiral. While greed can be a powerful motivator, chasing ‘get-rich-quick’ schemes often comes with risks and can undermine a strong, long-term investment strategy. Instead, one might consider adopting a long-term approach, This kind of balanced strategy can provide both stability and growth over time, as investing is a long-term undertaking with patience being the main cornerstone of building wealth over time. An unstable market often leads investors to pull their money out before they should. Fact is that markets are naturally volatile, rising and falling due to various factors on a daily basis. Hence, when emotions override patience, it can lead to panic selling or purchasing of overpriced stocks.

Concentration of Wealth

Elon Musk has become the first trillionaire, entering a new phase of the oligarchic era. Previously, when we described the wealth of the world’s richest billionaires, it was understood as the wealth of a few hundred billions. Why is such wealth concentration a problem? For decades, neoliberal economic thinking has urged us to accept cuts in the tax rates of the richest on the basis that eventually their wealth will trickle down to everybody. The claim has been that everyone benefits from the rich becoming billionaires and now trillionaires. But even the IMF has by now accepted that this is not true. It is an optimistic ideological myth to ensure that we stop worrying about widening inequalities. A less unequal distribution of wealth in the world would allow humanity to address crucial global challenges such as global heating, while 99% of the global population would live better lives, given the corrosive mental health effects and social isolation that tend to come with drive to reach extreme wealth. We should focus most of our attention on the  main reason against billionaire and trillionaire wealth and the harms it creates. Extreme wealth concentration undermines democracies. These harms lead to social problems, and even economic damage because disproportionate corporate power risks making the economy less fair and competitive. The ultimate danger is the so-called oligarchic endgame theory, whereby power is concentrated among the super-rich. Governments, captured by the richest, do everything to protect the privileges of this group and its supporters. As a result, democracy itself is at risk if the rigid social hierarchy implied by this concentration of power among the wealthiest becomes reality.

Conclusion

Warren Buffett popularised a contrarian investing strategy where investors identify current market sentiment and then act against it. This means to buy during market fear when everyone is selling as prices are low to sell when everyone is buying as prices are high. In reality, disciplined investing as opposed to emotional investing, is about investing in line with what the fundamentals are saying rather than following the noise of market sentiment. Thus, Warren Buffett will only buy when quality stocks in his view are currently undervalued. Similarly, he will only sell  when these quality  stocks become overvalued. Following this principle, Warren Buffet has survived many critical market situations and crashes. Hence, it comes as no surprise that many investors continue to be guided by his organisation’s investment decisions.

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