 In "With All Your Possessions", Tamari criticizes Werner Sombart and Max Weber for focusing solely on contemporary Jewish behavior, and neglecting Jewish tradition and religion.By comparison, Aaron Levine of Yeshiva University, who has published many well-received books on the topic of Jewish business ethics, bases his approach almost exclusively on the religious side, namely normative dictates of Jewish law (halacha).Another common approach focuses on homiletic expressions from the Bible and other Jewish sources about the importance of integrity.