On the design of peer punishment experiments

Some peer punishment technologies may bias experimental results in unwanted ways. A critical parameter to consider in the design is the "fine-to-fee" ratio, which measures the income reduction for the targeted subject relative to the cost for the subject who requested the punishment. We show that a punishment technology commonly used in experiments embeds a variable fine-to-fee ratio and show that it could confound the empirical findings about why, whom, and how much subjects punish.