Assume that a company announces unexpectedly high earnings in a particular quarter. In an efficient market one might expect __________.[Fill in the blank]

Question

BlackTom AI · Accepted Answer

In an efficient market, new public information is incorporated into prices almost immediately, so an unexpected positive earnings surprise will produce an abnormal price change right after the announcement.

1) Relevant knowledge points and concepts
- Market efficiency (especially the semi-strong form): publicly available information (earnings announcements) is quickly and accurately reflected in asset prices.
- Abnormal return/price change: the difference between the actual return and the expected return based on available information prior to the announcement.
- Information timing: if information is truly unexpected and public, it cannot be systematically exploited before release in an efficient market (absent insider trading).

2) Step-by-step reasoning
- The company releases unexpectedly high earnings; that is new public information that upgrades investors’ expectations of future cash flows.
- Under semi-strong market efficiency, investors immediately process that information and revise valuations upward.
- The price must adjust to reflect the new valuation; that adjustment appears as an abnormal price change at or just after the announcement.

3) Calculations
- No numerical calculation is required here. Conceptually, abnormal return = actual return − expected return (where expected return incorporates all prior public information). After the surprise, actual return exceeds expected return, producing a positive abnormal return.

4) Why the correct answer is correct
- Option (a) states “an abnormal price change immediately after the announcement,” which matches the semi-strong efficiency prediction: price moves once the surprise is revealed. The move is “abnormal” because it was not anticipated by prior public information.

5) Why the other options are incorrect
- (b) “an abnormal price increase before the announcement”: would imply leakage/insider information; not predicted in an efficient market.
- (c) “an abnormal price decrease after the announcement”: contradicts the sign of the surprise (earnings were unexpectedly high), so the abnormal change should be positive, not negative.
- (d) “no abnormal price change before or after”: contradicts semi-strong efficiency, which predicts a post-announcement adjustment to new public information.

6) Conclusion
Therefore, the correct choice is (a) an abnormal price change immediately after the announcement, which matches the provided answer.

Assume that a company announces unexpectedly high earnings in a particular quarter. In an efficient market one might expect __________.[Fill in the blank]Single choice

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