what is the dow jones measured in
The following are popular indexes, each measuring a different segment of the market: Dow Jones Industrial Average-This is the oldest and most well-known stock market index, made up of 30 actively traded blue-chip stocks. The Dow tends to be used as an indicator of market trends, rather than as an index against which to measure performance. Standard & Poorâs 500-Stock Index (S&P 500) - measures the performance of 500 widely held common stocks of large-cap U.S. companies.