The Late Evaluation Effect And Financial Markets

Evaluations made later in a sequence are more positive — what effects will this have on the thinking of investors?

It is no secret that people dislike working hard.  The corollary is that they like not working hard.  This much is well-known, but perhaps less obvious is that this can affect our judgments.  There are various experiments reported in the psychological literature which show that if a scenario is arranged such that the people involved are having a better time, or working less hard, they will make more positive judgements.  This can be quite alarming.  For example, it has been shown that judges making parole decisions are more likely to be lenient right after lunch and more strict before it.

A recent experiment has expanded this literature in a direction which I think is interesting in a financial markets context.  The University of Virginia’s O’Connor and Cheema, writing in Psychological Science in the issue of 01 May 2018, describe a bias of this type.  I will term it the Late Evaluation Bias.  They observe the following.

Evaluations become more positive when conducted later in a sequence

The authors examined three particular types of evaluation.  These were those made by judged across 20 years of Dancing With The Stars, university professors who had taught the same course for several years and people judging short stories over a couple of weeks.  In each case, they found that evaluations became more positive as time went on.

I think this is a variant of the types of bias I mentioned at the outset.  People find it easier to do something when they have more practice doing it.  This means they need to put in less effort so they will find it less like hard work.  This is fine, but the strangeness is that this will then lead them to make more positive evaluations.  Note that this is rightly called a bias since it will lead to a systematically false evaluations.

How might this play out in financial markets?  One simple and obvious answer is that investors will tend to be more positive than they ought to be when evaluating a stock they have evaluated many times before.  Someone who has looked at owning GE stock many times in the past will be more likely to find it easier to do again and will therefore be more likely than is justifiable to come to a positive decision on that stock.  This could feed into bubbles such as Bitcoin, although there is no reasoned positive evaluation possible of that cryptocurrency since it is valueless on fundamentals.

Similarly, people will evaluate asset classes with which they are more familiar more positively than they ought to.  This could be behind the well-known and expensive tendency in investors to be over-invested in their home markets.  This tendency can be avoided without entering dangerous frontier markets.  US investors could safely invest in the UK market without taking much additional risk and vice versa.  Both groups would gain valuable diversification.

People who have never bought a corporate bond will find it harder to evaluate than an equity if they have considered equities many times previously.  This will also rob them of a potentially valuable diversification.   The answer, as it often is, is to do more work!

I cover the effects of many other biases in financial markets in my new book:

https://www.amazon.com/Psychology-Successful-Trading-Behavioural-Profitability/dp/1138096288

Author: Tim Short

I am a former investment banking and securitisation specialist, having spent nearly a decade on the trading floor of several international investment banks. Throughout my career, I worked closely with syndicate/traders in order to establish the types of paper which would trade well and gained significant and broad experience in financial markets. Many people have trading experience similar to the above. What marks me out is what I did next. I decided to pursue my interest in philosophy at Doctoral level, specialising in the psychology of how we predict and explain the behaviour of others, and in particular, the errors or biases we are prone to in that process. I have used my experience to write The Psychology of Successful Trading. In this book, I combine the above experience and knowledge to show how biases can lead to inaccurate predictions of the behaviour of other market participants, and how remedying those biases can lead to better predictions and major profits. Learn more on the About Me page.

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