private information truthfully before voting takes place. Depending on the distance between two feasible public good levels …, the optimal mechanism involves either one or two voting rounds. We show that procedural efficiency cannot be achieved by … communication among all citizens prior to voting. Finally, we outline several applications of the mechanism. …

's key predictions in a laboratory experiment. The model's predictions are largely borne out - transparency negatively … affects information aggregation at the deliberation and voting stages, leading to sharply different committee error rates than … under secrecy. This occurs despite subjects revealing more information under transparency than theory predicts. …

high enough. We test the model's key predictions in a laboratory experiment varying the level of transparency between … than in theory. …