For clarification, a tax is where the value of the charge or the price per unit is set by the Government in advance and your activities determine the extent of the liability. The primary purpose of a tax is to raise revenue for Government purposes. The primary purpose of the emissions trading scheme is not to raise revenue; it's to drive down emissions. In fact, people actually say, "What do you think the price of emissions should be?" Now, as Minister, I have to be aware that anything I say would influence the market, but, in an ideal world, the price of an ETS unit should be zero, because there would be no demand, and there would be no demand because New Zealand would have reduced its emissions down to net zero, right? So that is actually the demonstration of whether or not it's a tax, because if you wanted a tax, you would put something in place that was, essentially, raising revenue for the purposes of raising revenue over an extended or, in fact, a permanent period of time. That is not the purpose of this emissions trading scheme. I have to say, once again, that that is not a question in the scope of this bill, which is to examine whether or not there should be a confidential reserve price. 