单选题 Within an informationally efficient securities market, new information results in profit-maximizing investors making price adjustments that are best described as:

A、

A. predictable but not unbiased.
B、

B. unbiased but not predictable.
C、

C. neither unbiased nor predictable.

【正确答案】 B

【答案解析】In an information ally efficient securities market, price adjustments are assumed to be rapid but not perfect; the adjustment is unbiased, but the market may over or under adjust and investors cannot predict which will occur.