Does October Effect Really Exist?

There are many adages in the financial services industry relating to the stock market. As I described in my blog post, Sell in May and Go Away, these phrases may be catchy, but they are not always completely accurate. One such adage that typically resurfaces in the fall is “the October effect”. This implies that historically October can be a “scary” time for markets. What is actually true is that September is the worst month historically when speaking about returns and more often October actually accounts for the end of bear markets rather than the start of them. Admittedly though, October has included some of the worst times in the stock market such as the Panic of 1907, Black Tuesday and Black Thursday of 1929, as well as Black Monday 1987. And although returns might not be the worst in October, it is a very volatile month. As shown below from a chart on MarketWatch, the standard deviation of daily changes in the Dow Jones Industrial Average is actually the highest during October at over 1.4% compared to the 1.1% average.

October effect

While the month may be the most volatile, it usually finds a way to recover. The average returns since 1928 are actually worse in February, May, and September with October still having .5% average one month returns. Also, we are currently coming off two of the best quarters since the great recession and although there is uncertainty leading into the election, along with uncertainty of continued pandemic spread, moving into October does not mean the market will totally drop.

During October in an election year, investors’ emotions can easily get the best of them as they struggle with the idea of sticking to the fundamentals of investing based on risk tolerance and rebalancing. Considering an election year as a whole, data from 1992-2020 shows the average net fund flows were $176 billion to money markets and $76 billion towards equity funds, but that number swaps the year following elections when things settle down and $168 billion flows into equity funds and only $36 billion to money markets.

net funds

After the political uncertainty of elections is over, business leaders are able to adapt and move forward under the new or current party. Analysts are also able to start getting a better handle on companies as well as the economic environment and things begin to be priced into the market.

It may be tempting, but ultimately it is too difficult to time the market just right to get out in order to miss the volatility of October, especially with an election and a pandemic, but get back in when others are not.

dow jones composite

So far, the first week of this month things are going ok. What is important is to continue to stay investing in long term healthy assets classes based on your risk tolerance. And if you are still working, continue to dollar cost averages into retirement accounts with weekly, biweekly, or monthly investments.

Matthews Barnett, CFP®, ChFC ®, CLU®   Financial Planning Specialist


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