 The ghetto's money or scrip, the so-called "Rumki" (sometimes "Chaimki"), was derived from his name, as it had been his idea.His face was put on the ghetto postage stamps and currency, which led to his sarcastic nickname "King Chaim".By industrializing the Łódź Ghetto, he hoped to make the community indispensable to the Germans and save the people of Łódź.