By industrializing the Łódź Ghetto, he hoped to make the community indispensable to the Germans and save the people of Łódź. On April 5, 1940, Rumkowski petitioned the Germans for materials for the Jews in exchange for desperately needed food and money. By the end of the month, the Germans had acquiesced, in part, agreeing to provide food, but not money. Although Rumkowski and other "Jewish elders" of the Nazi era came to be regarded as collaborators and traitors, historians have reassessed this judgment since the late 20th century in light of the terrible conditions of the time. A survivor of the Łódź ghetto, Arnold Mostowicz, noted in his memoir that Rumkowski gave a percentage of his people a chance to survive two years longer than the Jews of the Warsaw Ghetto, destroyed in the Uprising. However, as noted by Lucjan Dobroszycki, the ultimate decision on the future was not his to make.