4
votes
1answer
801 views

SP500 sector weights - how do they change?

The weights of the nine S&P equity sector indexes vary over time. One can find measures of them in a number of different formats: S&P 500 Sector SPDRs - historical sector weights Here's ...
4
votes
2answers
168 views

Indexes/stocks with flat implied volatilities

After the 1987 crash, the S&P500 index implied volatility changed from nearly flat to negatively sloped. According to Rubinstein the Black-Scholes model was not so wrong when applied to the ...