A portfolio manager believes that certain market inefficiencies exist and can be exploited through active management, but acknowledges that public information is generally reflected in stock prices. What form of the Efficient Market Hypothesis (EMH) does this belief align with?
- AWeak-form EMH.
- BStrong-form EMH.
- CSemi-strong form EMH.
- DAdaptive Market Hypothesis (AMH).
Show answer & explanationAnswer & explanation
Correct answer: C. Semi-strong form EMH.
The semi-strong form EMH states that all publicly available information is already reflected in stock prices, meaning technical and fundamental analysis cannot consistently generate abnormal returns. However, it implies that private or 'insider' information could potentially lead to abnormal returns. The belief that public information is reflected but inefficiencies can be exploited (implying some information isn't fully reflected or a skill in interpreting it) aligns with challenging the semi-strong form.
Why the other options are wrong
- A. Weak-form EMH states only past prices are reflected, implying technical analysis is useless but fundamental analysis could work.
- B. Strong-form EMH states all information (public and private) is reflected, making no form of analysis consistently profitable.
- D. AMH is a newer theory suggesting market efficiency is dynamic and adapts over time, not a specific 'form' of EMH.
Semi-Strong Form EMH
A hypothesis stating that all publicly available information (past prices, financial statements, news) is already fully reflected in a security's price, making it impossible to consistently earn abnormal returns using fundamental analysis.
- Public information is immediately priced in.
- Neither technical nor fundamental analysis can consistently beat the market.
- Insider information *could* potentially lead to abnormal returns.
- Many active managers operate under the assumption that they can exploit subtle inefficiencies within this form.
Memory trick: EMH forms: Weak, Semi-Strong, Strong – know where you belong!