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The sufficiency principle hyperinflates the price of productivity

Yang’s (2016) Price of Linguistic Productivity (PoLP) and the target article in this volume claim to offer a solution to the issue of how learners recognize when constructions (or “rules”) may be used productively. For example, the English prefix, pre-, is productive insofar as it can be applied to any noun or proper name that can be construed to evoke a temporal onset (pre-children, pre-tornado, precomputers; pre-Jon Stewart, pre-Melania, pre-Twister...). The suffix -ness which can be applied to adjectives to create nouns can also be applied productively (crumbliness dingbattiness), even though the productive suffix has a number of exceptions (??youngness; ??honestness). Yang suggests that productivity is determined by the following three key numbers: