There was always some subset of the S&P that mattered way more than the rest, just like the S&P matters way more than the Russel. Typically, you probably need

There was always some subset of the S&P that mattered way more than the rest, just like the S&P matters way more than the Russel. Typically, you probably need to go down to the S&P 25 rather than the S&P 10.