What does the Efficient Market Hypothesis imply for investing?

What does the Efficient Market Hypothesis imply for investing?

• A. Active management beats the market
• B. Prices fail to reflect information
• C. Markets ignore news
• D. Prices reflect all available information and beating the market is difficult; supports passive investing

Answer: (D)

Prices reflect all available information and prices adjust quickly to new information. This means you can’t reliably earn excess returns by picking stocks or timing the market, once costs are considered. Any potential extra gain comes from taking on more risk or from private information, not from skillful analysis of public information alone. Because of that, a practical investing approach is often to use broad, diversified, low-cost passive investments (like index funds) and accept that beating the market consistently is difficult. If you see statements claiming active managers will consistently beat the market, or that prices ignore information or miss news, those conflict with EMH because EMH asserts prices already reflect available information and adjust swiftly, leaving little room for systematic outperformance.

Prices reflect all available information and prices adjust quickly to new information. This means you can’t reliably earn excess returns by picking stocks or timing the market, once costs are considered. Any potential extra gain comes from taking on more risk or from private information, not from skillful analysis of public information alone. Because of that, a practical investing approach is often to use broad, diversified, low-cost passive investments (like index funds) and accept that beating the market consistently is difficult.

If you see statements claiming active managers will consistently beat the market, or that prices ignore information or miss news, those conflict with EMH because EMH asserts prices already reflect available information and adjust swiftly, leaving little room for systematic outperformance.