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Stock Market 'Sell in May and Go Away' in 9 out of 11 Countries Makes Sense to Do So

Stock-Markets / Stock Market 2017 May 03, 2017 - 10:56 PM GMT

By: Dimitri_Speck

Stock-Markets

Most people are probably aware of the saying "sell in May and go away". This popular seasonal Wall Street truism implies that the market's performance is far worse in the six summer months than in the six winter months.

Numerous studies have been undertaken particularly with respect to US stock markets, which confirm the relative weakness of the stock market in the summer.


What is the status of the "sell in May" rule in other countries though? I have examined the patterns in the eleven most important stock markets in the world.

The Eleven Largest Markets in the World Under the Seasonal Microscope

I have taken a look at the popular benchmark stock indexes of the eleven countries with the largest market capitalization from 1970 onward, or starting from the earliest year as of which continuous price data are available.

The comparison divides the calendar year into a summer half-year from May to October and a winter half-year from November to April. The position is assumed to be closed out on the first trading day of the following month. In the respective half-year in which no position in stocks is taken, a cash position that earns no interest is assumed to be held, so as to avoid any distortions of the stock market's seasonal returns by including interest income.

This much I will say in advance: The results are clear, in all eleven countries the winter half-year outperformed the summer half-year significantly. In the majority of these eleven countries one would actually have lost money during the summer half-year on average! These countries are:

  • Canada
  • France
  • Germany
  • Japan
  • Taiwan
  • United Kingdom

In other words, in these countries it would have been definitely better to go on vacation in the summer months - or to invest elsewhere.

The Half-Year Patterns of Nine Selected Countries

The charts below show the chained stock market performance in nine of the eleven countries during the summer months in red, during the winter months in green as well as the full year returns (=actual performance of the index) in blue.

Note: the charts are linearly scaled, as a result of which the performance patterns of the summer and winter half-year periods visually don't appear to add up to the full year performance.

Canada: Summer Half-Year vs. Winter Half-Year

Canada: Summer Half-Year vs. Winter Half-Year
The winter half-year even beats the full year!
Source: Seasonax

China: Summer Half-Year vs. Winter Half-Year

China: Summer Half-Year vs. Winter Half-Year
Prices rise almost as strongly in the winter months as over the full year
Source: Seasonax

France: Summer Half-Year vs. Winter Half-Year

France: Summer Half-Year vs. Winter Half-Year
The winter half-year beats the full year significantly!
Source: Seasonax

Germany: Summer Half-Year vs. Winter Half-Year

Germany: Summer Half-Year vs. Winter Half-Year
Once again the winter half-year clearly beats even the year as a whole!
Source: Seasonax

Japan: Summer Half-Year vs. Winter Half-Year

Japan: Summer Half-Year vs. Winter Half-Year
If one employs the "sell in May" strategy, even Japan is in a long term bull market
Source: Seasonax

Korea: Summer Half-Year vs. Winter Half-Year

Korea: Summer Half-Year vs. Winter Half-Year
During the winter prices rise almost as much as over the year as a whole
Source: Seasonax

Taiwan: Summer Half-Year vs. Winter Half-Year

Taiwan: Summer Half-Year vs. Winter Half-Year
In Taiwan the summer half-year is deeply in the red
Source: Seasonax

United Kingdom: Summer Half-Year vs. Winter Half-Year

United Kingdom: Summer Half-Year vs. Winter Half-Year
It suffices to be invested during the winter months
Source: Seasonax

US: Summer Half-Year vs. Winter Half-Year

US: Summer Half-Year vs. Winter Half-Year
The winter half-year beats the summer half-year, but not the full year
Source: Seasonax

In all of the markets shown here it was sensible to sell in early May - as the markets either posted losses or gains of less than one percent in the summer months in these countries. Investing in these markets during the summer was barely worth it: After all, by employing the "sell in May" strategy, one is also exposed to less risk because one is only invested half of the time.


Detailed Results by Country

The following table shows the half-year results of the eleven countries in detail. Half-year periods in which it was profitable to be invested on a risk-adjusted basis are highlighted in green. Half-year periods that generated losses are highlighted in red.

Overview of Country Selection: Half-Year Results

Overview of Country Selection: Half-Year Results
Investing during the summer period was not profitable Source: Seasonax

The table underscores that the summer weakness (a.k.a. the "Halloween Effect") does indeed exist. Although it is a very simple and well-known rule, the pattern still works. Apparently a far too small number of investors is actually taking action based on their knowledge of the pattern and there is almost no arbitrage activity either.

The stability and persistence of the pattern suggests that "sell in May" will continue to work in the future. Sometimes the simple rules are the best!

Note though: the table above is not complete - there are two countries in which investing in the summer months is actually profitable. If you want to learn which countries are defying the "Sell in May" rule and offer good prospects during the otherwise poor season, visit Seaonax News www.seasonax.com/news for a complete overview.

Yours sincerely,

Dimitri Speck,

Seasonax.com

Dimitri Speck is the founder of Seasonax and author of The Gold Cartel, published by Palgrave Macmillan.

© 2017 Copyright Dimitri Speck - All Rights Reserved - Disclaimer: The above is a matter of opinion provided for general information purposes only and is not intended as investment advice. Information and analysis above are derived from sources and utilising methods believed to be reliable, but we cannot accept responsibility for any losses you may incur as a result of this analysis. Individuals should consult with their personal financial advisors.


© 2005-2018 http://www.MarketOracle.co.uk - The Market Oracle is a FREE Daily Financial Markets Analysis & Forecasting online publication.


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