问题如下：
Tim creates a sophisticated model to forecast the overall stock market's fluctuation. He uses this model's predictions to help him earning an excess return, an income over the fair return for the risk involved. The model's predictions are used to decide whether to sell, buy, or hold an index fund's shares (the index fund aims to replicate the stock market' movements). Which of the following statements is correct?
选项：
A. Tim would best be characterized as a hedger.
B. Tim would best be characterized as an investor.
C. Tim would best be characterized as an information-motivated trader.
解释：
C is correct.
Tim believes that he is able to obtain superior information about the movements of the stock market by using his model. His trading motive is that he can utilize that infomation to make a trading profit. Therefore, Tim is best characterized as an information-motivated trader.
请问怎么区分investor和information-M trader，看了讲义并不是很明白。谢谢