Sharelynx has done some phenomenal long term work on the Dow Gold ratio.
http://www.sharelynx.com/chartstemp/DowGoldRatio.php
Prechter, in his At the Crest of the Tidal Wave, shows some long term US stock market charts dating back to before 1800. Those charts appear to be normalized to the DJIA. I think Prechter worked with The Foundation for the Study of Cycles to come up with these charts.
Prechter's charts show a US stock market index price of about 4 in 1800, 40 in 1900, and 4000 in 1995, the year the book was published, which of course has grown to about 10,000 today. Comparing this to David Hackett Fisher's inflation waves shows that US stock prices increased approximately 10 fold during the Victorian Equilibrium period of stable prices, but increased 250 fold during the following inflation wave.
This gets into the first e-mail discussion I had with John years ago. A 10 fold growth rate over 100 years is 2.3% (compounded annually) real growth (in the absence of inflation). The Sharelynx data shows something similar. Their 200 year growth rate would be something like 2.0% (exactly 20 fold over the past 150 years as a reference point, with the line being straight), where the annual rate of price increase in the DJIA has exceeded the annual rate of increase in the gold price by 2.0%. I had originally thought to take the annual increase in above ground gold supply into account, but am not sure whether that should be done or not, or how to do it. In theory, the gold price stays even with inflation, so this should not be necessary.
As I pointed out to John years ago, a 2-3% long term growth rate is unsustainable. It has never occurred. Therefore, the slopes of all these straight lines on the log charts are too steep if a time horizon beyond 200 years is taken into consideration. I would estimate the real sustainable long term growth rate over the past 2 millenia to be closer to 0.5%.
Whether any of that is relevant to the discussion depends on whether things are undergoing a phase change to slower or negative growth. Based on Elliott Wave Theory, Prechter would say he has evidence a phase change is near (fifth of a fifth of a fifth, overthrow above the 200 year channel, and all that). I agree for different reasons. I won't get into all those reasons here. An example:
http://netenergy.theoildrum.com/node/6356#more
If recent 2.5% real growth rates revert to a mean value of 0.5%, this implies approximately 1.5% real contraction in the economy for a very long time, which implies stock prices will go to or near ZERO, which is where I think they are going.
For those who believe for whatever reason that 2-3% real growth rates are sustainable for a few more decades, then 200 years of data are adequate.
While the periphery breaks down rather slowly at first, the capital cities of the hegemon should collapse suddenly and violently.