In the book: The Right Stock at the Right Time Prospering in the Coming Good Years by Larry Williams, are published some statistics from 1871
of the Index: S & P Composite Stock Price Index, whose data he took from this site:
http://aida.econ.yale.edu/shiller/data.htm
this page is no longer there, but the home page is of the Nobel Prize: Robert J. Shiller (Co-Winner of the 2013 Nobel Prize in Economics):
http://www.econ.yale.edu/~shiller/
so I believe that the data published in the book of Larry Williams are reliable.
Probably at that time this was the reference Index, and only later became the S & P 500.
Also on this page by legendary trader Dan Zanger, there is this chart showing that as early as 1870 there was a Stock Market Index that later became
the S & P 500:
https://www.traderslog.com/the-10-key-differences-between-bull-and-bear-rallies/

of the Index: S & P Composite Stock Price Index, whose data he took from this site:
http://aida.econ.yale.edu/shiller/data.htm
this page is no longer there, but the home page is of the Nobel Prize: Robert J. Shiller (Co-Winner of the 2013 Nobel Prize in Economics):
http://www.econ.yale.edu/~shiller/
so I believe that the data published in the book of Larry Williams are reliable.
Probably at that time this was the reference Index, and only later became the S & P 500.
Also on this page by legendary trader Dan Zanger, there is this chart showing that as early as 1870 there was a Stock Market Index that later became
the S & P 500:
https://www.traderslog.com/the-10-key-differences-between-bull-and-bear-rallies/





