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Many of you reading this short note will have at some time, travelled down to Devon for a summer break.

Some of you may have ventured into Plymouth - famous naval seaport, home to Sir Francis Drake and site of the departure of the Mayflower with the pilgrims on board heading to America 400 years ago this year. Even fewer will know that it was the place of an amazing insight into the powerful nature of crowds, which provides us with a wonderful word picture of how markets operate.

In 1906 a Victorian gentleman named Sir Francis Galton attended a livestock fair aptly named 'The West of England Fat Stock and Poultry Exhibition' in Plymouth. One of the many attractions at the fair was a guess the weight of the ‘dressed’ ox on display (similar to the game of guessing how many jellybeans are in a glass jar).

The competition attracted 800 people all paying 6d (half a shilling) to write down their guess, name and address on the back of the ticket. The nearest guess to the actual weight would win a prize. The fair attracted many sorts, from the general public (old and young) to farmers and butchers. Being a statistician Galton bought the used tickets off the stall holder. Of the 800, 787 were usable. Back home he analysed the guesses and published his finding in Nature, March 7, 1917 in an article titled ‘Vox Populi’1. His remarkable finding is illustrated below.

Figure 1: Guessing the weight of the ox – the ‘crowd’ got it more-or-less spot on.

You can view the original article here: http://galton.org/essays/1900-1911/galton-1907-vox-populi.pdf

ox

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The range of guesses was wide (-133 lbs. below the average to +86 lbs. above it), the participants were varied, and the numbers involved were quite large. The ‘crowd’ in aggregate showed ‘wisdom’ compared to its individual participants.

This story provides a great insight into how modern financial markets work. The markets are made up of many players, from individual DIY investors, day traders, stockbrokers, hedge funds, fund managers, sovereign wealth funds, endowments and other institutional investors.

Each investor holds their own view on the future prospects for a specific security (a tradeable financial asset) - such as the price of BP or Apple shares. Some will like a stock and others won’t. They cannot both be right. The market – given all the information available to it – settles on an equilibrium price for every stock. This price will move, sometimes dramatically, as we have seen recently as the ‘market’ reaches a new equilibrium price, given the new information that it has collectively processed.

At times like these, some investors are prone to running ‘what if’ scenarios in their heads such as: ‘if companies are in trouble because their revenues have been cut off, then they will renege on their property lease terms and landlords will suffer. It seems likely that things will get worse over the coming weeks. If property landlords are in trouble that might lead to problems in the banking sector’. That sounds plausible. They may then be tempted to sell out of property or banks or even equities altogether.

The crucial mistake is that they forget that they are not the only person to have thought this and these very sentiments and views are already reflected in the current price of listed commercial property companies, bank stocks and the markets in general.

Markets will move again – down or up – based on the release of new information, which is random. Second guessing random events is futile. You may make a guess and be lucky - but that is speculating not investing.

As Charles Ellis, the wise sage of investing from the US, states: ‘In investing, activity is almost always in surplus’.

Activity based on guessing, particularly when it relates to shorter-term issues that sit well within your true investment horizon – is best avoided.

Next time you pass Plymouth on the A38, reflect on one of its great historical events, The West of England Fat Stock and Poultry Exhibition of 1906.

Note: if you are interested in this subject and have time to fill in the coming weeks, perhaps take a look at The Wisdom of Crowds by James Surowiecki published by Greener Books.

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