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Understand Trend Following

From PFP:

An economist at the Bank of England, Andy Haldane has conducted a simple experiment that gets across the essence of trend-following. Imagine an investment strategy in US stocks based entirely on the past direction of the stock market. If the market rises during the prior period, the strategy buys stocks for the next period. If the market falls during the prior period, the strategy sells. The strategy simply extrapolates the most recent market trend. If you had started this process in 1880 with $1, shifting in and out of the stock market in response to the market’s prevailing trend, you would now have over $50,000.

Alternatively, you could have pursued a crude value strategy instead. This strategy assesses whether the market is undervalued or overvalued and buys only when value gives a positive signal. The criterion for assessing value is Robert Shiller’s dividend discount model. We like Shiller, but this crude value strategy is not particularly compelling in Haldane’s experiment. If you had started in 1880 with $1, you would now have 11 cents.

But focusing on the stock market in isolation is missing the point. Trend-followers, unlike most fund managers, are not myopically focused on the stock market to the exclusion of all other financial assets. They scour other markets for trends, too: interest rates; currencies; commodities; metals. And unlike most fund managers, they are just as content to sell the market as they are to buy it. Which is why the correlation of most trend-following funds to traditional markets like those for stocks and bonds is more or less zero.


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Posted in Economics, Trend Following
2 comments on “Understand Trend Following
  1. Gav Gray says:

    Nate Silver argues the opposite of this in his book, “The Noise and The Signal”. He sides with Shiller’s model, and gives a very poor example of why momentum trading (eg. trend following) doesn’t work. The chapter is a sour note in what is otherwise a pretty interesting book.

  2. lucky says:

    Haldane used Robert Shiller’s data for analysis.


    “That’s a problem because when Shiller shows a monthly price for the S&P 500, that price is the average for the month and NOT the month-end (or month-beginning or anything else). In other words, that price isn’t actually knowable until the end of the month (and by then, it’s no longer obtainable).”

    Haldane simulated going back in time, not trend following.

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