Sure. If you really insist for an example, I can give at least one where the author observably did ask himself the question "does value have a source" and attempted to answer it in a definitive manner.
And - how lucky we are! - he did find the definitive answer (that there is a only one, direct or indirect, single, source of value), and also the problem and injustice it brings, and - how even luckier we are! - the definitive solution :
I suspect that by now we have a reasonably significant number of clues that "his findings", and proposals, haven't worked out as great as one would hope for, though.
"Cyril" pronounced "see real". I code stuff.
"To study and not think is a waste. To think and not study is dangerous." -- Confucius
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