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If prices do not instantaneously adjust to and fully reflect the public news announcements relative...

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Finance

If prices do not instantaneously adjust to and fully reflect the public news announcements relative to a stock, which of the following is false? Select one: a. Some investors may be able to make an abnormal return from this price behavior. b. It will be possible to create a trading rule based on the news announcements. c. This is a violation of semi-strong form efficiency. d. This is a violation of weak-form efficiency.

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