I'm interested in how they're pricing the S&P 500 before it existed. Yes, you could just say, "the biggest 500 public companies in the US" -- but it's a little

I'm interested in how they're pricing the S&P 500 before it existed. Yes, you could just say, "the biggest 500 public companies in the US" -- but it's a little more nuanced than that, so it'd be interesting to see how it's calculated.