DAVID SEYMOUR (Leader—ACT): Thank you, Madam Chair. Further to that, I appreciate the Minister's answer about the amount of revenue that might be forgone compared with the estimates because of avoidance activity and because of the uncertainties around Penny and Hooper and the jurisprudence of whether or not people will be able to use particular vehicles to avoid tax, and we accept that the Minister is being quite candid that he can't be very precise about how much avoidance activity might go on and, therefore, how much revenue might actually be raised, which, in fairness, is the whole purpose of the policy. But I'd like to ask if he's got any advice or any wisdom on another question, which is around not so much people earning income and then structuring their affairs to avoid declaring it in a way that qualifies it to be, I guess, rated as or declared as income tax but actual behavioural change in the sense that people don't actually carry out productive activity at all, given the reduced return for that activity. In other words, does he have an estimate for the dead-weight loss? 