Yusuf Mansur, writing in the Jordan Times, argues that two of the factors to which Senor and Singer attribute Israel's success, the IDF and Soviet-Jewish immigration, have only been sustainable because of the foreign aid that Israel receives from the United States and private sources. Mansur also faults the authors for suggesting that the disparity between entrepreneurship in Israel's Arab and Jewish sectors is rooted in the exemption of Arabs from military service rather than what Mansour perceives to be "the discriminatory policies of Israel against its Arab citizens," particularly in education and the labor market.[20]