What Behavioural Biases Drove Speculative Trading During the Dot-Com Era?

Figure 1: An illustration of how Behavioural Biases can lead to irrational investing
Source: MarketXLS

The Dot-com Era stands as a testament to the tie between human psychology and financial markets, where behavioural biases propelled speculative trading to unprecedented heights before the bubble burst. If we go deeper into these biases and their underlying causes we can get invaluable insights into the dynamics of market bubbles.

Overconfidence Bias:

Overconfidence bias, deeply rooted in human nature, led investors to show an exaggerated belief in their ability to predict the future trajectory of technology stocks. The rapid advancement of the internet and the perceived paradigm shift in business models fuelled this overconfidence, blinding investors to the inherent risks. They erroneously assumed that their knowledge of technology represented an edge in navigating the market, which therefore fuelled speculative trading activities and inflated stock prices beyond rational levels.

Herding Behaviour:

During the Dot-Com Era, herding behaviour, driven by the fear of missing out (FOMO), amplified the speculative fervour. The vastness of internet-related innovations and the temptation of astronomical returns created a sense of urgency among investors to join. As tech stocks soared to new heights, the fear of being left behind prompted investors to abandon rational analysis and blindly follow the crowd. This herd mentality intensified market dynamics, magnifying both the ascent and eventual collapse of the bubble.

Figure 2: An illustration of how investors can be led astray by simply 'following the crowd' when investing
Source: Okonomos


Anchoring Bias:

Anchoring bias, a cognitive shortcut ingrained in human decision-making, showed a profound influence on investor behaviour during the Dot-Com Era. The initial success and drastic rise of internet companies served as perfect anchors, shaping investors' perceptions of future stock prices. Despite building evidence of overvaluation and unsustainable growth rates, investors clung loyally to these anchors, unwilling to reconsider their expectations. This anchoring effect compounded market exuberance, prolonging the euphoria before reality shattered the illusion.

Confirmation Bias:

Confirmation bias, a pervasive cognitive tendency, reinforced investors' bullish beliefs during the Dot-Com Era. The positive news and optimistic forecasts surrounding internet companies validated investors' pre-existing beliefs, fostering a self-reinforcing cycle of positivity. Amidst the cacophony of optimism, investors selectively filtered out dissenting voices and contrary evidence, dismissing warnings of an impending market correction. This confirmation bias fostered an echo chamber of optimism, further fuelling speculative trading activities and contributing to the eventual unravelling of the bubble.

In conclusion, the Dot-com Era serves as a compelling case study highlighting the profound impact of behavioural biases on financial markets. By dissecting these biases and their underlying causes, we gain deeper insights into the intricate mechanisms driving speculative bubbles and their inevitable bursts.

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