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I think both: hired sell their capacity to transform inputs in a higher value output; time & knowledge & strength (some professions) are the variables intrinsic to the transformation process. Yes you extend “time” but also “knowledge” & “force” to the organization, but mainly capaciy to “transform” inputs in valuable outputs.
But I disagree about “no coercion involved”; that depends on your level of expertise, and if you are a ” medium or low-level” your strength on that trade is irrisory, you have to accept the trade you like it or not.