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According to form of efficiency, prices reflect all information, including public and private. If the market is this-type form efficient, then investors earn abnormal returns regardless of the information they p Empirical evidence indicates that markets are not this ters earn abnormal returns. form of efficiency, prices reflect all information, including public and private. rket is this-type form efficient, then investors earn abnormal returns regardless of the information they possess levidence indicates that markets are not this-type form efficient because insiders earn abnormal returns