The Commission found that "though the Arabs have benefited by the development of the country owing to Jewish immigration, this has had no conciliatory effect. On the contrary, improvement in the economic situation in Palestine has meant the deterioration of the political situation". Addressing the "Arab charge that the Jews have obtained too large a proportion of good land cannot be maintained," the Commission noted that "Much of the land now carrying orange groves was sand dunes or swamp and uncultivated when it was purchased." They write that "The shortage of land is, we consider, due less to the amount of land acquired by Jews than to the increase in the Arab population". "Endeavours to control the alienation of land by Arabs to Jews have not been successful. In the hills there is no more room for further close settlement by Jews; in the plains it should only be allowed under certain restrictions."