What impact do short-selling constraints have on market efficiency?      (25 marks)
         Briefly describe the main risks faced by short-sellers.                              (20 marks）
         Some hege funds regularly buy data on the stock lending market and short interest in stocks. What do you think they do with this data?        (25 marks)
         The China Securities Regulatory Commission changed its regulations in 2010 to allow short-selling on mainland Chinese stock markets. What are the likely implications of this decision?                                                                             (25 marks)
           
            作业的要求：—— briefly answer  英文回答哈
            需要evidence——引用的什么文献（国外的哈），出处，请写明。
            麻烦大家了 帮帮忙哈