October is the Most Dangerous Month

The prospect of steep market declines worries investors – and the month of October has a particularly bad reputation in this respect.

 

Bad juju month: Statistically, October is actually not the worst month on average – but it is home to several of history’s most memorable crashes, including the largest ever one-day decline on Wall Street. A few things worth noting about 1987: 1. the crash did not presage a recession. 2. its extraordinary size was the result of a structural change in the market, as new technology, new trading methods and new hedging strategies were deployed. 3. Bernie (whoever he was/is) got six months.

 

Regarding point 2: in particular, the interplay between program trading and “portfolio insurance” proved deadly (the former describes computerized arbitrage between cash and futures markets, the latter was a hedging strategy very similar to delta-hedging of puts, which involved shorting of S&P futures with the aim of making large equity portfolios impervious to losses – an idea that turned out to be flawed). Too many investors tried to obtain “insurance” by selling index futures at the same time, which pushed S&P futures to a vast discount vs. the spot market. This in turn triggered selling of stocks and concurrent buying of futures by program trading operations – which put more pressure on spot prices and in turn triggered more selling of futures for insurance purposes, and so on. The vicious spiral produced a one-day loss of 22.6% – today this would be equivalent to a DJIA decline of almost 5,000 points. Due to circuit breakers introduced after 1987, very big declines will lead to temporary trading halts nowadays (since 2013 the staggered threshold levels are declines of 7%, 13% and 20%; after 3:25 pm EST the market is allowed to misbehave as it sees fit). Interestingly, program trading curbs were scrapped again. We mention the case of 1987 because we believe today’s markets will eventually be faced with a “positive feedback loop” problem as well. Many new trading strategies and products that have become popular during the Bernanke/Yellen echo bubble era have yet to be truly stress tested. There are numerous new systematic strategies (almost all of which use leverage in some shape or form), there are now more listed ETFs and ETNs than listed stocks, high frequency trading is responsible for a very large share of trading volume, and open derivatives positions have grown extraordinarily large relative to trading volume in the underlying cash instruments. Market volatility has all but disappeared over the past 18 months or so, but this is reminiscent of a pressure cooker. It seems highly likely that lot of “pent-up volatility” will eventually be unleashed (there is a very good reason to expect this to happen; extended periods of low volatility tend to go hand in hand with the gradual buildup of ever larger speculative positions which depend on its continuation; and this is usually accompanied by a steady increase in leverage with the aim of boosting returns. As an aside, lately we quite often come across articles that explain why the market cannot go down, no matter what (here is a recent example that reminds us a bit of the “keiretsu argument of stock market invulnerability” that was popular in Japan in the late 1980s). [PT]

Although the month of October delivers an acceptable performance in seasonal terms if one disregards outliers like the crashes of 1987 and 2008, these particularly strong declines over such short time periods are nevertheless scary: what use is it to anyone if the market performs well in October several times in a row, but then generates such a large one-off loss that all previous gains evaporate? And what about intermittent losses?

Let as examine these extreme market moves more closely. The following chart shows the 20 largest one-day declines in the Dow Jones Industrial Average. Crashes that occurred in October are highlighted in red.

 

The 20 Biggest One-Day Declines in the DJIA – extremely strong one-day declines happen particularly often in October

Source: Wikipedia

 

9 of the 20 strongest one-day declines occurred in October. That is an extremely disproportionate frequency. In other words, October has a strong tendency to deliver negative surprises to stock market investors – in the form of sudden crashes.

 

Outliers Are “Real”

Things look quite differently in the first half of the year. Only two of the 20 largest historical declines have taken place in these six months.

Investors must not allow themselves to be deceived. Such extreme price declines may be rare, but they exhibit seasonal tendencies as well. In most years it is more likely that gains rather than losses are generated, but as noted above, the losses frequently turn out to be exceptionally large.

 

October Moves Sideways on Average

October, it is actually not a particularly weak month on average. This is illustrated by the seasonal chart of the Dow Jones Industrial Average shown below, which encompassing a very long time period. Seasonal charts are different from standard charts; they don’t depict actual prices over a specific, definite time period.

Rather, they represent an average of many years of prices, which are shown in relation to the time of the year. The chart below illustrates the average price pattern of the DJIA calculated over a very long time span, namely the past 117 years. The horizontal axis depicts the time of the year, the vertical axis shows the price information (indexed to 100).

 

Dow Jones Industrial Average, seasonal price pattern over the past 117 years. On average the market actually moves sideways in October.

 

The chart illustrates the typical seasonal price pattern of the DJIA. A s the chart indicates, the statistically weakest month is actually September rather than October. In the course of October the market tends to move sideways on average. Net-net it even exhibits a small gain, albeit a well below average one.

Nevertheless, October delivers a better average performance than its reputation among stock market participants would suggest. Of course this reputation is not entirely undeserved, given that particularly large short term declines actually do very often occur in October.

 

Seasonax: Detailed Statistics on Every Seasonal Pattern and Time Period

With the Seasonax app one can not only examine the seasonal seasonal price patterns of all instruments available at Bloomberg or Thomson Reuters, one can also study every conceivable time period in great detail. Simply type “APPS SEASON” into the Bloomberg Professional Terminal, or select the App Studio in the Thomson Reuters menu and call up Seasonax from there. Choose the instrument to be examined and highlight the relevant time period via mouse click-and-drag. This can inter alia help with portfolio optimization with a view toward avoiding or reducing exposure to extreme seasonal risks.

 

Charts by Seasonax

 

Image captions by PT where indicated

 

Dimitri Speck specializes in pattern recognition and trading systems development. He is the founder of Seasonax, the company which created the Seasonax app for the Bloomberg and Thomson-Reuters systems. He also publishes the website www.SeasonalCharts.com, which features selected seasonal charts for interested investors free of charge. In his book The Gold Cartel (published by Palgrave Macmillan), Dimitri provides a unique perspective on the history of gold price manipulation, government intervention in markets and the vast credit excesses of recent decades. His ground-breaking work on intraday patterns in gold prices was inter alia used by financial supervisors to gather evidence on the manipulation of the now defunct gold and silver fix method in London. His Stay-C commodities trading strategy won several awards in Europe; it was the best-performing quantitative commodities fund ever listed on a German exchange. For detailed information on the Seasonax app click here (n.b., subscriptions through Acting Man qualify for a special discount).

 

 

 

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Dear Readers!

You may have noticed that our so-called “semiannual” funding drive, which started sometime in the summer if memory serves, has seamlessly segued into the winter. In fact, the year is almost over! We assure you this is not merely evidence of our chutzpa; rather, it is indicative of the fact that ad income still needs to be supplemented in order to support upkeep of the site. Naturally, the traditional benefits that can be spontaneously triggered by donations to this site remain operative regardless of the season - ranging from a boost to general well-being/happiness (inter alia featuring improved sleep & appetite), children including you in their songs, up to the likely allotment of privileges in the afterlife, etc., etc., but the Christmas season is probably an especially propitious time to cross our palms with silver. A special thank you to all readers who have already chipped in, your generosity is greatly appreciated. Regardless of that, we are honored by everybody's readership and hope we have managed to add a little value to your life.

   

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