EOC Reading 5 Question 5 - Prospect Theory

Zoey

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“I follow a disciplined approach to investing. When a stock has appreciated by 15% I sell it. I also sell when it has declined by 25% from initial purchase price.”
The client is most likely behaving consistently with:
Prospect Theory, Expected Utility Theory, or Behavioral Portfolio Theory?
I chose Prospect Theory based on the loss aversion present in prospect theory. However, the correct answer is expected utility theory. It says that “Loss-aversion in prospect theory is discussed from a different perspective.”
Can someone then explain to me what perspective prospect theory approaches loss aversion from? What even is prospect theory?
 
Teh Prospect Theory stratement would have been “When a stock has appreciated by 15% I sell it. I won’t sell when it has declined from initial purchase price”. You are right with regards to the first part (buy), but wrong in the second. The behaviour of the investor appears to be rationale, thus utility theory.
 
Prospect theory is by far the most confusing part of the BF readings.
 
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