“( )”这一理论基本思想可以归纳为:在证券市场上交易者如果根据获得的一组信息而无法获得额外盈利(即经济利润),那么,就可以认为资本市场是有效的。
A.投资组合理论
B.有效市场理论
C.期权定价理论
D.有效需求理论
正确答案是B
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