In Vivian's case, her unit of production isn't the tangible hours she works, it's the intangible difference she makes during that one hour of work.
Tiesą sakant, Vivian atveju, jos "gamybos vienetas" nėra apčiuopiamos darbo valandos, kurias ji dirba. Tai yra neapčiuopiamas skirtumas, kurį ji sukuria per tą savo darbo valandą.