问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
怎么判断出是short呢
NO.PZ2019052801000030问题如下You are a portfolio manager with a $25 million equity portfolio. The portfolio beta relative to the S P 500 is 1.5. The S P 500 futures are trang 1,000, anthe multiplier is 250. You woullike to hee your exposure to market risk over the next few months. Whether a long or short hee is appropriate, anwhis the number of S P 500 contracts you neeto implement the hee? A.Short 150 contracts. B.Long 150 contracts. C.Short 100 contracts. Long 100 contracts.A is correct. 考点Heing With StoInx Futures解析1.5×25,000,0001,000×250=1501.5\times\frac{25,000,000}{1,000\times250}=1501.5×1,000×25025,000,000=150 contracts所以基金经理应该short150份合约来进行对冲。N算出来最后是正数，不应该是long吗
题目中说hee your exposure to market risk,我的理解是market risk 的expectebata=1，这样理解不对吗
