Although the DJIA is one of the oldest and the most commonly followed equity indices, many professionals consider the Dow to be an inadequate representation of the overall U.S. stock market compared to broader market indices such as the S&P 500 or Russell 3000 Index. The DJIA includes only 30 large companies and is a price-weighted index, unlike later stock indices which use market capitalization. Furthermore, the DJIA does not use a weighted arithmetic mean.[4][5][6][7]