Dan Ariely opens by presenting extensive behavioral economics research demonstrating that human decision-making consistently follows predictable irrational patterns, challenging conventional economic assumptions of purely rational decision-making calculation.

Why this predictable-irrationality thesis proves so significant:

• Conventional economic theory has traditionally assumed rational decision-making calculation, while Ariely's extensive experimental research demonstrates consistent, predictable departures from this purely rational model
• This finding has significant implications for understanding actual human behavior across economic, business, and personal decision-making contexts
• This opening establishes the book's foundational research-based thesis, motivating its subsequent detailed examination of specific predictable irrational patterns

This opening establishes the book's foundational thesis regarding predictable irrational decision-making patterns, challenging conventional purely rational economic assumptions through extensive experimental research.