By and large, behavioral science suggests that human beings make lousy investors. Whilst we are excellent problem solvers, we suffer from a whole host of well documented biases that, on average, erode the investment returns on offer from markets. Being aware of our biases is a useful exercise if we are to limit the impact that they have on our decision making. In this short note, we look at both anchoring – the tendency to be influenced by a particular reference point or ‘anchor’ – and recency bias – the tendency to overemphasize the importance of more recent experiences relative to less recent ones.
Today’s capital markets are extremely well integrated, costs are low and anyone with internet access can use the power of Google (or even perhaps ChatGPT) to conduct their own research. However, historically investors have favored companies listed in their home country as opposed to those abroad. Partially this was down to the additional cost, complexity, and unfamiliarity of investing overseas, although these hurdles are relatively negligible nowadays. Even so, recent data suggest that the ‘home bias’ - the extent to which the home country is weighted in a portfolio over and above its market weight – persists.
Perhaps anchoring to the performance of one’s domestic market is to be expected given the above. For UK investors, the FTSE 100 measures the performance of the largest 100 firms listed in the UK and is frequently quoted in the papers and media outlets. For some time, the UK has performed dismally when compared to international (ex-UK) developed markets. For example, the decade of the 2010’s saw the FTSE 100 companies return ≈75% to investors whilst international equity markets delivered a staggering ≈255% in GBP terms! Since the start of 2021, the roles have reversed with the FTSE 100 delivering 31% versus 16% from international markets.
Enter recency bias. The charts below investigate the shorter and longer period returns of the FTSE 100 and global developed equities further . In the top chart, rolling annual returns show that the UK has generally lagged, although it has enjoyed a handful of 12-month periods of outperformance.
Zooming out to rolling 10-year periods paints a different picture. This is due to the many small periods of underperformance above compounding up to provide poorer outcomes over longer horizons, as demonstrated below.
The point is not to suggest that the UK is some sort of anomaly, or that this level of relative underperformance is to be expected moving forwards. There are plenty of examples throughout history demonstrating exactly the opposite. The point is that getting swayed by recent performance, and perhaps anchoring to one’s domestic market, is best avoided.
Removing our performance hats and replacing them with our risk ones, there are some very sensible reasons why having too many eggs in the 100 largest companies in the UK makes little sense from an investment portfolio perspective:
Be aware of that anchor and make sure that you do not get overly influenced by what has just performed well. You have no chance guessing which market will do well next. Just own the world.
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