Stock Indexes (or Indicies if you prefer)

Wit so many stock indexes available, it makes sense to know what they are and how they are made. NOTE: they are not all the same.

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    Fascinating! Dow Jones History

    From a niche news agency in an obscure Wall Street basement to a global news and business-information leader, the vision at Dow Jones & Company has been consistent and defining for more than a century.

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    Index effect

    With index funds and ETF's it is not surprising that they stock price jumps (better liquidity etc), what is more interesting is that there seems to be an effect on operations.

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    Information Costs and Liquidity Effects from Changes in the Dow Jones Industrial Average List

    We examine the stock market effect of changes in the composition of the Dow Jones Industrial Average (DJIA). Unlike S&P 500 listing studies, we find that the price and the trading volume of newly listed DJIA firms are unaffected.

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    The math (from S&P) on market weighted indexes

    Market weighted indexes are by far the most common.

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    S&P Dow Jones Indices " Dow Jones Averages " Literature Center

    Information on how the Dow Jones is calculated (and many others!)

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    Stock market indexes explainedby Wikipedia

    A stock index or stock market index is a method of measuring the value of a section of the stock market. It is computed from the prices of selected stocks (typically a weighted average). It is a tool used by investors and financial managers to describe the market, and to compare the return on specific investments.

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    What Drives the S&P 500 Inclusion Effect? An Analytical Source

    Not all agree that inclusion improves operating performance: "We present an analytical survey of the explanations-price pressure, downward-sloping demand curves, improved liquidity, improved operating performance, and increased investor awareness-for the increase in stock value associated with inclusion in the S&P 500 Index. We find that increased investor awareness is the primary factor behind the cross-section of abnormal announcement returns."

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    S&P's guidelines

    Straight from the market leader

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