而且，与这些问题相关的是，随着援助水平上升存在回报下降的风险。 目前萨哈拉沙漠以南非洲国家外援和GDP的比例很高。
This reflects such problems as macroeconomic management, aid-dependency syndromes, absorption capacity, transaction costs, and − related to all of it − the risk of decreasing returns as aid levels rise.