Everyone lies, especially stock indices

VicodinThe Dow Jones is a price index, so it doesn't give you anything other than what it's supposed to: price! The vast majority of investors follow its performance without even knowing that this index was not designed for that. In fact, a price index does not take into account dividends paid by the underlying companies. Most stock indices around the world are price indices, such as the CAC 40 or the SMI.

To take into account the impact of dividends, we must base ourselves not on a price index, but on a performance index, such as the DJITR, the CAC 40 GR or the SPI for example. Most price indices have their "total return" performance equivalent. If we had counted the dividends since its launch on May 26, 1896, the Dow Jones would today be at 1,300,000, not 13,000, or 100 times more!

La supercherie ne s'arrête pas là. Les indices ne vous mentent pas seulement parce qu'ils ne tiennent pas compte des dividendes. Ils mettent aussi scandaleusement de côté l'inflation et la dévaluation des monnaies, qui vont de pair. En regardant le Dow Jones sur les dix dernières années, on pourrait se dire que la désormais fameuse "décennie perdue" n'a pas été aussi catastrophique pour les grosses capitalisations américaines.

Performance of the Dow Jones and the USD/CHF pair

But during the same period the dollar lost more than 35% against the Swiss franc. In the end you could have obtained a similar profitability with less risk by investing in bonds... Worse, taking into account inflation since its creation in 1896, the Dow Jones would today vegetate at only 450! We can therefore understand the interest of certain investors for the yellow metal.

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Now let's consider the "true" value of the Dow Jones, taking into account both dividends and inflation. This theoretical index would be around 47,000 today, which is quite an achievement considering the weakness of the greenback. Dividends therefore put the need to cover one's portfolio with gold into perspective. 

Since 1871, the S&P has posted an annual total return of 9.2%. Inflation contributes just under a quarter of this return (2.2% per year), as does real capital growth (i.e. inflation-adjusted price movements). As for grandpa's "boring" dividends, wisely reinvested year after year, they have contributed more than half of the total return, or 4.8% per year!

Spx_total_return

In the end, price indices only show a small part of the picture, and no one seems to care. Dr. House was right: "Why put TVs in the bedrooms of people who are in a coma?"

 Sources:
http://bigpicture.typepad.com/comments/2007/05/where_have_sp50.html
http://online.wsj.com/article/SB10001424052970204571404577257373285657442.html 
http://blog.djindexes.com/index.php/with-or-without-the-impact-of-dividends-on-index-performance/

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5 thoughts on “Tout le monde ment, surtout les indices boursiers”

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    Pierre-Olivier Langevin

    This is one reason why the S&P 500 index is based on market capitalization rather than price weighted.

  2. blank

    Overall I agree with the article, but there is one major parameter missing from the calculations: taxes! This considerably reduces the yield.

    1. blank

      Good point Astyx. However, it is difficult to integrate into these calculations as they vary depending on the person's situation, their income, their fortune, their region, their country, the type of their investments, etc.

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