  This paper experimentally evaluates four mechanisms intended to achieve the
Uniform outcome in rationing problems (Sprumont, 1991). Our benchmark is the
dominant-strategy, direct-revelation mechanism of the Uniform rule. A
strategically equivalent mechanism that provides non-binding feedback during
the reporting period greatly improves performance. A sequential revelation
mechanism produces modest improvements despite not possessing dominant
strategies. A novel, obviously strategy-proof mechanism, devised by Arribillaga
et al. (2023), does not improve performance. We characterize each alternative
to the direct mechanism, finding general lessons about the advantages of
real-time feedback and sequentiality of play as well as the potential
shortcomings of an obviously strategy-proof mechanism.
