Understanding Cumulative Risk Perception from Judgments and Choices: An Application to Flood Risks

Area of Science:

• Environmental science
• Risk assessment
• Behavioral economics

Background:

• Catastrophic events like floods, though rare individually, pose substantial cumulative risks over time.
• Understanding public perception of these cumulative risks is essential for effective risk management and insurance uptake.
• Current risk communication often focuses on annual probabilities, potentially misrepresenting long-term threats.

Purpose of the Study:

• To assess public perception of cumulative flood risks.
• To investigate how risk perception influences insurance choices.
• To determine if providing cumulative risk information improves perception and decision-making.

Main Methods:

• Participant surveys to gauge risk perception and insurance preferences.
• Analysis of risk perception distributions (bimodal assessment).
• Experimental manipulation presenting cumulative risk information versus annual probabilities.

Main Results:

• Participant risk judgments followed a bimodal distribution: underestimation and moderate overestimation.
• Individuals underestimating cumulative risk exhibited more risk-seeking insurance choices.
• Explicit cumulative risk information significantly improved risk perception and protective choices.

Conclusions:

• Public perception of cumulative flood risk is often inaccurate, leading to suboptimal insurance decisions.
• Communicating risk over relevant timeframes, rather than annually, is an effective strategy.
• Improved risk perception through clear information can enhance individual preparedness for rare but impactful events.