还是觉得a有点疑问

问题如下：

What would cause the company's share price to change in an efficient market?

选项：

A.

Private information from insiders.

B.

The stock price change of the previous day.

C.

New information made to public.

解释：

C is correct.

In an efficient market, price changes in every single day are independent and investors will react to new, independent information when it comes into the market.

考点：Efficient Capital Market And Its Forms

如果说市场是有效的，相当于告诉我们股票价格等于价值即当前股票价格已经反映了全部的信息。只有当新的信息出现，价格才会随之发生变化。