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2024-06-13
https://www.investopedia.com/terms/d/djia.asp
What Is the Dow Jones Industrial Average (DJIA)?

The Dow Jones Industrial Average (DJIA) is a stock market index that tracks 30 large, publicly-owned blue-chip companies trading on the New York Stock Exchange (NYSE) and Nasdaq. The Dow Jones is named after Charles Dow, who created the index in 1896 along with his business partner, Edward Jones. Also referred to as the Dow 30, the index is considered to be a gauge of the broader U.S. economy.1


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2024-6-13 01:51:56
KEY TAKEAWAYS
The Dow Jones Industrial Average is a widely-watched benchmark index in the U.S. for blue-chip stocks.
The DJIA is a price-weighted index that tracks 30 large, publicly-owned companies trading on the New York Stock Exchange and the Nasdaq.
The index was created by Charles Dow in 1896 to serve as a proxy for the broader U.S. economy.
2
The DJIA's composition can change over time based on economic trends.
The Dow Divisor is a constant that was created to address the simple average issue.
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2024-6-13 01:52:14
Understanding the Dow Jones Industrial Average (DJIA)
The DJIA is the second-oldest U.S. market index after the Dow Jones Transportation Average. The DJIA was designed to serve as a proxy for the health of the broader U.S. economy. Often referred to simply as the Dow, it is one of the most-watched stock market indexes in the world. While the Dow includes a range of companies, all of them can be described as blue-chip companies with consistently stable earnings.
3

In the early 20th century, the performance of industrial companies was typically tied to the overall growth rate in the economy. That cemented the relationship between the Dow's performance and the overall economy. Even today, for many investors, a strong-performing Dow equals a strong economy while a weak-performing Dow indicates a slowing economy.
2

As the economy changes over time, so does the composition of the index. A component of the Dow may be dropped when a company becomes less relevant to current trends of the economy, to be replaced by a new name that better reflects the shift. For instance, a company may be removed from the index when its market capitalization drops because of financial distress.
2

Stocks with higher share prices are given greater weight in the index. So a higher percentage move in a higher-priced component will have a greater impact on the final calculated value. At the Dow's inception, Charles Dow calculated the average by adding the prices of the 12 Dow component stocks and dividing by 12. The result was a simple average. Over time, there were additions and subtractions to the index that had to be accounted for, such as mergers and stock splits. At that point, a simple mean calculation no longer made sense.
4
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2024-6-13 01:52:35
The Dow Divisor and Index Calculation
The Dow Divisor was created to address the simple average issue. The divisor is a predetermined constant that is used to determine the effect of a one-point move in any of the approximately 30 stocks that comprise the Dow. There have been instances when the divisor needed to be changed so that the value of the Dow stayed consistent. As of February 2024, the Dow Divisor was 0.15265312230608.
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2024-6-13 01:52:58
The Dow is not calculated using a weighted arithmetic average and does not represent its component companies' market cap unlike the S&P 500. Rather, it reflects the sum of the price of one share of stock for all the components, divided by the divisor. Thus, a one-point move in any of the component stocks will move the index by an identical number of points.

DJIA Price = SUM (Component Stock Prices) ÷ Dow Divisor
The S&P 500 has outperformed the DJIA on an annualized basis over the last three-, five-, and 10-year periods.

S&P Dow Jones Indices. "S&P 500."
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2024-6-13 01:53:20
Dow Jones Industrial Average (DJIA) Index Components
The DJIA launched in 1896 with just 12 companies, primarily in the industrial sector. They included railroads, cotton, gas, sugar, tobacco, and oil. The index grew to 30 components by 1928. Since then, it's changed many times—the very first came three months after the 30-component index launched. The first large-scale change was in 1932 when eight stocks in the Dow were replaced.

The Dow is reevaluated regularly. Companies are replaced when they no longer meet the index's listing criteria with those that do. Over time, the index became a bellwether of the U.S. economy, reflecting economic changes. For example, U.S. Steel was removed from the index in 1991 and replaced by building material company Martin Marietta.
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