• The Dow 30, also known as the Dow Jones Industrial Average (DJIA), is made up of 30 major US public companies.

  • Companies in the Dow Jones index are constantly changing depending on their importance in the economy.
  • The Dow Jones Index is considered an indicator of the overall state of the market, since it takes the average value of the price of one share of all companies in the index.
  • Individuals can invest in the Dow through the Dow Jones Industrial Average ETF (DIA) SPDR.
  • Although both market indexes have the same goals, the DJIA and the S&P 500 differ from each other in size and calculation methods.
  • Critics of the Dow Jones think it does not represent the US market well because it only includes 30 large caps and is not weighted by market cap.