This chapter demonstrates the routine prevalence of forced labor in Germany prior to World War II, its expansion during the early years of the fighting, the slow introduction of concentration camp slave labor to the German economy, and the reasons for its adoption by nearly every major German enterprise. Contrary to common belief, the chief motivation driving both processes was the shortage of German workers, thanks to conscription and wartime demand for output, not the cost of the forced and slave laborers. But the great growth of German industrial capacity during the war owed much to these labor inputs.