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It wouldn’t be the case for occupations that are either unattractive in terms of the actual work (coal miner, sewage worker, fisherman, undertaker) or have high barrier to entry in terms of qualifications (neurosurgeon, PhD-level scientist, lawyer, professional sports).

Carpentry is reasonably attractive in terms of actual work, so that if it payed as well as software development, many people would want to take it up. My point is that a larger portion of the population would have the necessary ability (and, I assume, inclination) to become a competent carpenter than a competent software developer.