Apple Goes Into Dow

This week Apple Computer becomes part of the prestigious Dow Jones Industrial Average. The Dow is made up of 30 stocks and since its creation in 1896 has become the single most widely cited indicator of stock market performance. And yet its quirky structure shows the dangers of relying on any one indicator to mark investment performance. The Dow Jones average is based on just price, not the total value of the companies. Once a stock splits, its weight in the Dow goes down even though the value stays the same. After some moves in the Dow this week Goldman Sachs will have the heaviest weight in the average because it has the highest price. Moves in the price of Goldman stock will have a disproportionate affect on the average. Often the Dow moves in sync with other major averages such as the S&P 500 but many times they have widely divergent moves. While the Dow is a good shorthand way of following the stock market, keep in mind that its only a snapshot of a small number of stocks and there are thousands of other great companies.

http://www.bloomberg.com/news/articles/2015-03-19/never-mind-apple-it-s-the-goldman-sachs-era-in-dow-industrials