Investment expert Martin Pelletier said that investors often fail by becoming too emotionally attached to the stocks they own.
This psychological trap matters because it can lead traders to ignore a security's current risk and return profile in favor of defending a past decision.
Pelletier said that instead of evaluating an investment based on its current risk and return profile, investors begin to defend it [1]. This behavior often stems from focusing on the initial price paid for a stock rather than its current market value and future potential.
To illustrate the concept of detachment, Pelletier shared a personal anecdote regarding a trip taken two weekends ago [2]. He described a 6.5-hour drive [2] from Calgary to Vernon and Kelowna [2].
The trip was an attempt to escape a stubbornly wet Calgary spring characterized by snow and grey skies [2]. By stepping away from his immediate environment, Pelletier highlighted the importance of gaining a fresh perspective, a mental shift he said is necessary for objective investing.
Markets do not account for the price an individual paid for a share, he said [1]. When an investor clings to a stock because they are "down" on the position, they risk missing better opportunities elsewhere. This attachment creates a cognitive bias that prioritizes the recovery of lost capital over the optimization of a portfolio.
Pelletier said that the most effective way to manage a portfolio is to treat every holding as a new purchase. This approach forces the investor to ask whether they would buy the stock at its current price today, regardless of what they paid in the past, he said [1].
“"Instead of evaluating an investment based on its current risk and return profile, we begin to defend it"”
This perspective highlights the 'sunk cost fallacy' in behavioral finance, where individuals continue an endeavor based on previously invested resources. By advocating for a detachment from purchase price, Pelletier emphasizes a transition from emotional accounting to rational asset allocation, which is critical for maintaining portfolio liquidity and risk management in volatile markets.
