Clearly we do not mean by 'involuntary' unemployment the mere existence of an unexhausted capacity to work. An eight-hour day does not constitute unemployment because it is not beyond human capacity to work ten hours.

显然，我们所说的“非自愿”失业并不是指仅存在未用尽的工作能力。一天工作 8 小时并不构成失业，因为工作 10 小时并没有超出人类的能力范围。