为什么不是short HG and buy JL?

问题如下：

Hartmann is reviewing some possible trades for three stocks in the health care industry based on a pairs-trading strategy. Hartmann’s evaluations are as follows:

• HG Health is 15% overvalued.

• Corgent Cell Sciences is 10% overvalued.

• Johnson Labs is 15% undervalued.

Based on his trading strategy, which of the following should Hartmann recommend?

选项：

A.

Short HG Health and Corgent Cell Sciences

B.

Buy Johnson Labs and Corgent Cell Sciences

C.

Buy Johnson Labs and short Corgent Cell Sciences

解释：

Pairs trading involves buying an undervalued stock and shorting an overvalued stock in the same industry. Hartmann should buy Johnson Labs (15% undervalued) and short Corgent Cell Sciences (10% overvalued).