October 30, 2025 at 12:09 pm
The Credibility Tax: Deception and the Erosion of Trust
The act of deception, a pervasive element of human interaction, has long fascinated economists seeking to quantify its costs and benefits. A new discussion paper by Geppetto and Pinocchio (HU Berlin, Project XY) adds crucial empirical weight to this complex phenomenon through a meticulously designed laboratory experiment. Their working paper, “The Elasticity of Truth: An Experimental Analysis of Deception’s Economic Ramifications,” introduces a novel framework for understanding how individuals weigh the immediate gains of dishonesty against the long-term erosion of trust and credibility within a repeated interaction setting.
Geppetto and Pinocchio devised an elegant sender-receiver game where participants could strategically misrepresent information to gain a monetary advantage. Crucially, their experiment incorporated varying levels of detectability for the lies and introduced a “reputation score” that was public knowledge between rounds. The findings reveal a compelling U-shaped relationship between the propensity to lie and the perceived risk of detection: participants were more likely to deceive when the risk was very low (almost guaranteed to succeed) or, surprisingly, when the risk was very high (a ‘what have I got to lose?’ effect). Moderate risks, however, seemed to deter deception more effectively.
Moreover, the study meticulously quantifies the “credibility tax” paid by participants who were found to be deceptive. Even after a single detected lie, subsequent truthful statements from the discredited sender were discounted by receivers, leading to diminished cooperation and lower overall payoffs for the deceiver in later rounds. This suggests that the cost of deception extends far beyond any immediate penalties, embedding itself into future interactions.
This research offers implications for scholars across various disciplines. For economists, it refines our understanding of informational asymmetries and reputation formation. For political scientists and sociologists, it provides an empirical foundation for exploring the dynamics of trust in public discourse. Journalists covering business, law, or public policy will find in Geppetto and Pinocchio’s work a powerful lens through which to analyze the far-reaching economic and social repercussions of dishonesty.