Abstract
We implement multi-sender cheap talk in the laboratory. While full-information transmission is not theoretically feasible in the standard one-sender one-dimension model, in this setting with more senders and dimensions, full revelation is generically a robust equilibrium outcome. Our experimental results indicate that fully revealing outcomes are selected in particular settings, but that partial-information transmission is the norm. We uncover a number of behavioral patterns: Senders follow exaggeration strategies, qualitatively similar to those predicted by a special case for the fully revealing equilibrium. Receivers on the other hand follow differing heuristics depending on the senders' biases, which are not always sequentially rational. When full revelation is observed it is largely due to the intersection of the receiver heuristics with the equilibrium response.