So perhaps the Minister might care to rise to his feet and just give the committee some sense of what he's concluded, given the advice he's received. Does he believe that it'll be about half a billion dollars? Does he think it could be more because of the exuberance of people who Greg O'Connor's talked to, who apparently want to pay more tax? Or is it possible that, in actual fact, there's going to be significantly less than $550 million worth of revenue? If so, how much revenue does the Minister think will be brought in over each year over the next four years, based on his expert judgment and assessment of the advice he's received?