What is the main difference between NASDAQ, NYSE, AMEX, and the DJIA?

dbg14223: What is the main difference between NASDAQ, NYSE, AMEX, and the DJIA?
Does it all really matter? Are there differences?

Answers and Views:

Answer by knowitall
They each have a different select group of stocks they use to figure the averages.

Answer by jlf
You seem to be mixing up stock exchanges with stock indexes.

Answer by A nobody
DJIA, the Dow Jones Industrial Averages is an index used to track the movement of industrial stocks.

NASDAQ, NYSE and the AMEX are stock exchanges registered with the SEC for the purpose of providing a market place for stocks/bonds.

Yes it does matter, company pay to have their securities listed on these markets after they meet “listing” criteria. The exchanges have broker/dealers as members and only members can buy and sell on the exchange in which they are members