I will see if I can Google that page number. My history professor at Cal State Northridge made a particular point that slaves on the plantation did a fair amount of sabatoge. As industry becomes more complex a hostile work force is not substainible.I don't believe I argued anything of that sort at all? Rather, I said the available literature suggests that the industrial usage of slaves was already quite extensive and was as cost-effective/productive as the usage of free labor in the South. Germany is also not a good comparison at all for several reasons, but beyond that the academic consensus is that slave labor was a boon for their economy. See The Wages of Destruction by Adam Tooze, Page 535 in particular but the overall chapter "LABOUR, FOOD AND GENOCIDE" is a definitive read on the subject.
Interestingly enough two other nations with a history of harsh slavery similar to the US ; Brazil and South Africa imported European immigrants to work in industry rather then use former slaves. That might not be a coincidence.