How Does stock market make up a stock price index?

Question

The stock price index make up from where? And How does it change too fast from a business results for reglecting exactly those indexes ? BecauseA business results 's also the time for calculating!

and which basics does it stand against for those reglecting?

Answer 1

The market doesn't make up the index -- people do.

The Dow Jones Index, for example, is the average of thirty stocks (times a multiplier) picked by a panel of employees at Dow Jones. It is supposed to reflect changes in prices of stocks for blue chip companies.

Answer 2

can't say