A good example of market value- A market value-weighted index is the weighted index is the weighted average of the returns of each component security, with weights proportional to outstanding market value; Standard & Poor's Composite 500 simple average of the returns of each stock in an index; Dow Jones Industrial Average simple average of the returns of each stock in an index; Standard & Poor's Composite 500 average computed by adding the prices of the stocks and dividing by a "divisor"; Standard & Poor's Composite 500 weighted average of the returns of each component security, with weights proportional to outstanding market value; Dow Jones Industrial Average