Looking at the price/earnings and price/equity ratios of stocks from 1970 until now, I need to know whether they they've gone up substantially (and more importantly, increasingly, i.e., at an increasing rate, over those years), it contributes to plausibility. I'd especially be interested in finding this out about stocks in different sectors, especially the 'blue chips,' S&P, mid-caps, etc. (Not so much by type of company though, since these have changed in terms of their growth rates over the years.) Sources for this would be helpful,
Thanks in advance.
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