Michael Pettis of Peking University's Guanghua School of Management has argued that they cannot be.
2
北京大学光华管理学院应用经济学系副教授，院长助理；
Zhang Wei is associate professor of applied economics and the assistant of Dean in Guanghua School of Management, Peking University.
3
作者单位北京大学光华管理学院；上海财经大学高等研究院；北京大学中国医药经济研究中心。
Organization Guanghua School of Management, PKU; Institute for Advanced Research, SHUFE; China Center for Pharmacoeconomics and Outcomes Research, PKU.
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