There is a
book called – predictably
irrational by dan ariely which talks of the irrational behavior in most of
us. The more interesting part of the book however is the ‘predictable’ part. It
means that most of us are consistently irrational. The good thing about this
predictability is that if one can identify these patterns, then there is a
possibility of reducing the irrationality (I don’t think it can be completely
eliminated)
The first
step in reducing the irrationality is to name and classify the various
behaviors which impact us negatively as investors. I started exploring the various
biases which affect us in the previous
post and will continue with a few more in this post.
Authority
bias
You may seen
this bias in others (most people think they are themselves immune), when they purchased a stock based on a recommendation by
some TV presenter or commentator. In other cases, the recommendation may be
from a broker or some sales person in a bank.
I have
personally avoided this bias in the above form by having a simple thumb rule –
TV presenters are actors and should be watched for entertainment alone. As far
as brokers and sales people are concerned, I refuse to listen to them.The above comments may imply that I am immune to this bias – but I am not. I follow a few other bloggers and top investors. In the past, if one of them was invested in a stock, I would develop a much more positive view of the stock and even went ahead and invested in the same.
The biggest
source of my bias has been from the top thinkers in the field of investing (Warren
buffett, Ben graham etc). It is not that their teachings are not worthy of
following, but I have followed them blindly without understanding the context.
Case in point
– Warren buffett talks of the buy and hold philosophy. A lot of people miss out
that they he does not imply buy and forget and certainly not buy and hold bad
companies. The pre-requisite condition is that one should buy a good company at
an attractive price and then hold it for a long time. I have bought
duds and then held it for some time, thus compounding my mistake.
How does one
avoid this bias – As in all other biases, it is not easy. I have found one
approach which works for me a bit – Never accept blindly what others say
(including your idols). I try to analyze
the context of a statement or idea and try to think of a scenario where that
idea is not true.
First
conclusion biasThis is a very common bias and we know it by another name – First impressions. We tend to form opinions of other people in the first few seconds of meeting them and then any interaction tends to re-inforce the impression. This bias has a lot of implication in job interviews, but that is a separate topic.
In the case
of investing, this is closely related to the commitment and consistency bias.
As an investor, I have found that when I am looking at a company and its
financials, I tend to form a fuzzy view of the company in the first few minutes
– such as looks worth of investigation (may even buy) or maybe this company is
junk. Once I reach this view (often subconsciously), my subsequent analysis and
thought process is influenced by this first conclusion. In addition, if I make
a token purchase the commitment and consistency bias kicks in. Once this
happens, my decision is kind of locked (even if i think it is not)
How does one
avoid it ? For starters, I look at a company and form a view (even if subconscious)
and then just drop further analysis. I make a note of the company and then move
on to something else – allowing for a cooling period. I will usually come back
to it after a few days and then read up on it further – making notes as I go
along.
The final
decision to buy comes usually after a few weeks and even then the position is a
small one. I am not sure if I have been able to reduce the bais, but it
prevents me from buying a stock when I am in heat. The downside is that the
stock price may run up before I can buy a full position, though in balance I
would rather loose the upside occasionally than make a foolish decision.
The next post
will the final one on this topic and I will explore a few more biases and
discuss how it is important to build routines in your investment process to
reduce their impact.----------------
Stocks discussed in this post are for educational purpose only and not recommendations to buy or sell. Please contact a certified investment adviser for your investment decisions. Please read disclaimer towards the end of blog.
2 comments:
dear rohit
mental biases may not always be negative, since they have provided some protection benefit for many hunter gatherer years. it would be interesting to study if any bias has got protective effect too
regards
madhu
Charlie Munger had a great speech about human misjudgement a while ago. Very good read: http://www.fool.com/news/foth/2002/foth020821.htm
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