One of the most common errors identified by psychologists
and behavioural finance studies is that investors always tend to have a bias
against losing money. Unfortunately humans fear losses more than we appreciate
gains. This was confirmed in a simple university survey using a coin toss
whereby the participants would need an average payoff of $40 on a winning toss
to offset the pain of taking a potential loss of $20 on a losing toss. In other
words, the pain of a loss is twice as potent as the pleasure generated by a
gain.
As advisers, the above result demonstrates the reason we have
more trouble getting clients to sell a losing position, even when clients also
believe the position is likely to continue its loss for quite some time, in the
hope that they recover. Many times, this recovery rarely takes place, particularly
with small speculative companies with no profits.
This fear of loss and negativity bias may in fact blind an
investor to take advantage of good opportunities. It is often important to
weigh up the prospect of loss with that of the opportunity costs. It may also
mean that the portfolio struggles to outperform over time, as this loss
aversion bias leads to having too many losers being kept and too many winners
being sold (often too early).
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