Dow Jones average

The DJIA is the second-oldest U.S. market index, following the Dow Jones Transportation Average (DJTA), also created by Charles Dow.

The Dow Jones Industrial Average was originally intended to measure the movements of companies within the heavy industry, like construction companies and businesses dealing with heavy products. Today, however, that name is strictly historical; very few of the index's 30 companies have anything to do with industrial goods.

The 30 blue-chip companies, considered to be the leaders of the economy, are chosen by the editors of the Wall Street Journal, a practice that dates back to its inception in 1896.

The DJIA is price-weighted, meaning that the movement in stocks with higher prices impacts the Dow more than stocks with lower prices. The Dow's daily value is not the true average of the 30 stocks' prices, but is actually the sum of the prices divided by the Dow divisor, which is adjusted in cases of stock splits, spinoffs and other structural changes to keep the weighting constant and maintain continuity.

The Dow is one of the most closely watched market benchmarks tracking stock market activity. Although it was created to track the performance of the U.S. industrial sector, it now is seen as a proxy for general market conditions.

Today's Dow components are: