Abstract
This paper addresses a common criticism of certi fication processes: that they simultaneously generate excessive complexity, insufficient scrutiny and high rates of undue validation. We build a model of persuasion in which low and high types pool on their choice of complexity. A natural criterion based on forward induction selects the high-type optimal pooling equilibrium. More complexity always leads to lower scrutiny by the receiver because it makes understanding marginally more costly. When the receiver is biased towards rejection, more complexity also makes the receiver more selective, and the sender simplifies her report in equilibrium. When the receiver is biased towards validation, however, more complexity makes the receiver less selective, and we provide sufficient conditions that lead to complexity inflation in equilibrium.
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