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This lecture introduces semi-separating equilibrium as a type of perfect Bayesian equilibrium for signaling games. A less popular but still equivalent name for it is partially-pooling equilibrium.
In such an equilibrium, one type sometimes separates from another type and sometimes pools with another type. Semi-separating equilibria are computationally more difficult to solve for, but they also produce far more interesting strategies and predictions. We will therefore cover a couple more examples in this series.
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