The low down on the Dow, Apple's new home

Q: What is the Dow Jones industrial average?

A: Also known as simply the Dow, the Dow Jones industrial average is a price-based measure of blue chip businesses.

Q: When was it introduced?

A: May 26, 1896

Q: Why is it so prestigious?

A: The industrial average, along with the Dow Jones transportation average and Dow Jones utility average, were the world's first market indicators. Together, they comprise the Dow Jones Composite Average, a gauge of America's most esteemed companies.

Q: How many companies are included In the industrial average?

A: 30. When one is added, another is taken out.

Q: How does a company join the Dow?

A: Usually, a business must have a stellar reputation, show consistent growth, and have a significant following among investors. The Dow also seeks to maintain a healthy mix of sectors.

Q: How often do new companies join the Dow?

A: Rarely. Usually it happens after a company is purchased, or there's a major shift in a business's main focus.

Q:: Who oversees the Dow?

A: There is an "averages'' committee.

Q: Which Industries comprise the Dow?

A: All, except transportation and utilities, which have their own indexes