In portraying the more benign version of slavery, they also argue in their 1974 book that the material conditions under which the slaves lived and worked compared favorably to those of free workers in the agriculture and industry of the time.
奴隷のさらに親切な姿を描く際に、彼らは1974年の著書で、奴隷が行き働いた物質的状態が当時の自由農夫や工場労働者のそれに比べて良かったと指摘した。