Understanding the disposition effect

Investors have a tendency to sell assets that have earned them positive returns and are reluctant to let go of those that have brought them losses. This behavioural bias is called “disposition effect” and is attributed to loss aversion and regret avoidance. It has been widely documented by empirical research. The prevalence of the disposition effect is a key motivation behind trend following strategies. Now there is evidence that this effect is also cyclical: it seems to be stronger in market “bust periods” than in “boom periods”. This is consistent with prospect theory and heightened risk aversion in market downturns.

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Overconfidence and inattention as asset return factors

Overconfidence in personal beliefs and inattention to new trends are widespread in financial markets. If specific behavioural biases become common across investors they constitute sources of mispricing and – hence – return factors. Indeed, overconfidence and inattention can be quantified as factors to an equity market pricing model and seem to capture a wide range of pricing anomalies. This suggests that detecting sources of behavioural biases, such as attachment to ideological views or laziness in the analysis of data, offers opportunities for systematic returns.

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How human stress increases financial crisis risk

John Coates gives a neuroscience view on how human “stress response” can aggravate financial crises. Rising market volatility causes a bodily response in form of a sustained elevation of the stress hormone cortisol in traders and investors. This raises risk aversion and may contribute to institutional paralysis. Central banks’ policies aimed at keeping markets calm in normal times may weaken traders’ immune system.

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