Prospect Theory
Prospect Theory
Prospect Theory explains why people feel losses more intensely than equivalent gains, and why we tend to prefer certainty over risk. Losing $100 hurts significantly more than the joy of gaining $100.
Details
What is Prospect Theory?
Prospect Theory is a decision-making theory introduced in 1979 by Daniel Kahneman and Amos Tversky. It explains how people make choices under uncertainty, and Kahneman was awarded the Nobel Prize in Economics in 2002 for this research.
Core Principles
Mindy has outlined the key principles for you:
Loss Aversion
When faced with an equal gain and loss, the psychological impact of a loss is roughly twice as powerful. The pain of losing $100 feels far greater than the pleasure of gaining $100.
Reference Dependence
We judge value based on change relative to a reference point, not absolute levels. Whether your salary went up or down compared to last year affects your satisfaction far more than the actual amount itself.
Certainty Effect
In gain situations, people prefer a smaller but certain reward, while in loss situations, people are willing to take on larger uncertain risks to avoid a sure loss.
Prospect Theory in Everyday Life
Connection to Mental Well-Being
Prospect Theory also helps explain our emotional patterns. Because negative experiences carry more psychological weight, bad memories tend to linger longer than good ones. Understanding that this is a natural feature of how the mind works can help you avoid becoming overly consumed by negative feelings.
💡 Real-Life Example
When asked to choose between a guaranteed $500 and a 50% chance of winning $1,000, most people choose the guaranteed $500 — a classic demonstration of the Certainty Effect described in Prospect Theory.
This content is for educational purposes and does not replace professional medical diagnosis.