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The searches provided good information about P/E ratio history and general valuation ratios. Wikipedia and Investopedia are good starts, but I need something more authoritative for an external link in "History and Origin". I'll look for an academic source or a more established financial news source.

Let's refine the search for history. "Origins of financial multiples" or "early uses of P/E ratio".

Search 2: Academic paper/trusted source on limitations/critique.
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