RichardKennaway comments on What resources have increasing marginal utility? - Less Wrong Discussion
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Mathematically, everything is non-linear at its minima and maxima. Linear functions do not have minima or maxima.
Linear functions on closed bounded domains can (and on finite dimensional closed bounded domains must, IIRC) have minima and maxima. This seems to be Elo's implicit assumption in the first paragraph, that we were just talking about resources which are available in quantities between 0% and 100%.