We discuss the decision to delegate the regulation of pollution through sales of permits to a biased expert in a situation where the polluting firm has private information about its technology. We consider, in particular, constrained delegation where the government puts restrictions on the amount of pollution that the expert can sell permits for. We find that, in general, delegation is more likely if the firm is low-cost. This is not in line with the so-called uncertainty principle, which

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... that there is more delegation the more uncertainty the government faces.