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SPX settlement: when/why?



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Recently, I was discussing the different settlement terms of SPX (S&P
500 Index options) and OEX (S&P 100) options: where SPX's settlement
price is based upon Friday's opening prices, and OEX is based upon
the S&P 100's close on Friday.  However, I couldn't remember when
this change in SPX terms was made, or more importantly - why?
Was this change made in the aftermath of Oct-87?  What problem
did it intend to fix?