Fidelity Aggressive's dollar-weighted return is -33.4% a year, meaning the average customer did 25 points worse than the portfolio.

FORBES: The fortunes of an aggressive growth fund in a bear market.

The statistic that captures these results is called the dollar-weighted return.

FORBES: Stampede

Contrast the dollar-weighted return, which takes into account not only the percentage performance in each month but also the amount of dollars the manager has been given to work with.

FORBES: The fortunes of an aggressive growth fund in a bear market.