By the middle of the twentieth century, the production-boundary debate appeared to have disappeared from most mainstream economists' discourse.

Evidence (1)

What counts as productive? Redefining ‘producers’ in economic discourse, 1890–1960 — Problem, position, and contribution: the production boundary as a case of statistical redefinition

it appeared to drop out of the discourse of most mainstream economists.

https://doi.org/10.1080/03085147.2024.2404355#unit-1-p4

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