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but i can ...The Seven Deadly Sins in Investing
James Emanuel
Behavioral biases shape decision-making, often impairing rational choices in fund management and investing generally. By dissecting the "seven sins" in the investment process, we understand how biases like overconfidence, anchoring, and groupthink undermine effective investment strategy. This post critiques these pitfalls with examples, exploring how they detract from long-term returns and proposing how recognizing these biases can refine your investing approach to achieve superior results.
Sin 1, Pride
Don’t Be Proud, Admit You Can’t See The Future
Forecasting is integral in fund management, yet over-reliance on it is misguided. Fund managers’ overconfidence in predictions creates a perilous foundation for investment decisions, largely due to an inherent anchoring bias. ‘Anchoring’ occurs when investors latch onto seemingly relevant but ultimately unrelated data points, clouding judgment.
For instance, psychologists Englich, Mussweiler, and Strack conducted a study with criminal trial judges who were unknowingly influenced by random numbers when deciding on sentencing. Judges who were shown higher numbers issued harsher sentences, demonstrating how irrelevant anchors skewed their judgment. In fund management, similar anchoring happens when managers cling to forecasts without considering their actual predictive accuracy.
Forecasting for inflation, bond yields, and stock prices has shown poor accuracy. Economic forecasts, which tend to be backward-looking, often lag reality, as demonstrated by economist estimates of inflation rates based on previous trends rather than current data. The false security in prediction results from psychological overconfidence, as managers often rate themselves as more skilled than reality suggests. Studies reveal that 68% of equity analysts thought they were above average at forecasting earnings, while 75% of fund managers think they are above average at their jobs. Both of these are mathematically impossible given that the split of above and below average will be 50:50.
Lao Tzu, a poet who lived over 2,500 years ago, observed, “Those who have knowledge don’t predict. Those who predict don’t have knowledge”. This prophetic wisdom is born out in fact in the investing community with the worst performers generally being the most overconfident. Such individuals suffer a double curse of being unskilled and unaware of it.
This was evident among investors in energy companies prior to the 2014 oil price collapse. Leading up to 2014, oil prices had remained high for several years, and analysts confidently forecasted that global demand for oil would continue to rise. Investors bought heavily into oil and gas companies, assuming that high prices would sustain or even increase, providing stable returns for years to come.
Encouraged by these predictions, many investors overlooked warning signs such as the rapid growth in U.S. shale production and potential shifts in global energy consumption patterns. Large sums were invested in oil exploration and production, particularly in high-cost ventures that would only be profitable if oil prices stayed high. Analysts’ and investors’ pride in their forecasting led them to discount the possibility of a significant price drop.
In mid-2014, however, oil prices plummeted due to a supply glut and weakened global demand, catching investors off guard. Many energy stocks suffered steep losses, and numerous companies faced financial distress.
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