主题：Testing Ambiguity Theories with a Mean-Preserving Design
主讲人：上海财经大学 姚澜副教授
主持人：经济与管理研究院 梁平汉副教授
时 间：12月21日（星期一）下午2:00-3:30
地点：格致楼1211会议室
主办单位：财税学院 实验经济学实验室 科研处
主讲人简介：
姚澜，上海财经大学经济学院常任副教授，西班牙巴塞罗那自治大学经济学博士（2008年）。研究实验经济学，行为经济学，产业组织等，曾在Quarterly Journal of Economics, European Economic Review, Journal of Behavioral and Experimental Economics等国际一流期刊发表论文 。
讲座简介：
Prominent models such as MEU/α-MP and KMM interpret ambiguity aversion as aversion against second-order risks associated with ambiguous acts. We design an experiment where the decision maker draws twice with replacement in the typical Ellsberg two-color urns, but with a different color winning each time. Given this set of mean-preserving prospects, MEU/α-MP, KMM and Savage’s SEU all predict unequivocally that risk-averse DMs shall avoid the 50-50 urn that exhibits the highest risk conceivable, while risk-seeking ones do the opposite. However, we observe a substantial number of violations in the experiments. It appears that the ambiguity premium is partially paid to avoid the ambiguity issue per se, which is distinct from notions of second-order risk. This finding is robust even when there is only partial ambiguity.
