Fischbacher and Föllmi-Heusi present an experimental study on honesty and lying. Participants roll a die privately, with their payoff depending on the reported roll. The study aims to measure honesty and detect lying behavior. The design has three advantages: it reduces demand effects, is easy to implement, and allows testing of theoretical predictions. The results show that about 20% of inexperienced subjects lie maximally, 39% are fully honest, and 20% are partial liars. The study discusses motives for lying, including maintaining a favorable self-image. The design allows inferring population-level behavior without individual detection. The study finds that lying is robust across different treatment conditions, including high stakes, externalities, and anonymity. However, the effects are small and the patterns of lying remain consistent. The study also finds that honesty decreases over time, but partial lying persists. The results suggest that maintaining a favorable self-concept is a key motive for lying. The study concludes that the design is useful for further research on honesty and deception.Fischbacher and Föllmi-Heusi present an experimental study on honesty and lying. Participants roll a die privately, with their payoff depending on the reported roll. The study aims to measure honesty and detect lying behavior. The design has three advantages: it reduces demand effects, is easy to implement, and allows testing of theoretical predictions. The results show that about 20% of inexperienced subjects lie maximally, 39% are fully honest, and 20% are partial liars. The study discusses motives for lying, including maintaining a favorable self-image. The design allows inferring population-level behavior without individual detection. The study finds that lying is robust across different treatment conditions, including high stakes, externalities, and anonymity. However, the effects are small and the patterns of lying remain consistent. The study also finds that honesty decreases over time, but partial lying persists. The results suggest that maintaining a favorable self-concept is a key motive for lying. The study concludes that the design is useful for further research on honesty and deception.