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I don't know if one exists, but I'd like to see a graph of typical remuneration to authors in the years following publication of a book.
I'd assume, for most books, the returns from a particular work dwindle to practically nothing within 10 years (obviously there will be exceptions, and different types of work have different life spans) - I'd go with whatever average timescale gave authors 95% of the total return they could expect.
(The remaining 5% could take decades to accrue.)
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