Before revision:  Using the Gittins index (Gittins, 1979), we characterize which sender types use each signal more often, leading to a constraint on the receiver's off-path beliefs based on " type-compatibility " and hence a learning-based equilibrium selection.
After revision:  Using the Gittins index (Gittins, 1979), we characterize which sender types use each signal more often, leading to a constraint on the receiver's off-path beliefs based on " type compatibility " and hence a learning-based equilibrium selection.