The Government sends a signal: this is what we think, roughly, the cost of emissions should be and businesses should plan on that basis to make changes in their businesses either to mitigate their emissions or, if they can't, then to budget for having to offset them through the ETS. That's quite different from the electricity price market, where you're able to hedge, engage in forward purchases, and, at the end of the day, there is a willing seller, willing buyer element. In other words, a generator is able to sell electricity from a hydro dam or a coal-fired power station—and that seems to be much more popular this year than it was last year or the year before. They're able to sell that to their customers at a willing seller, willing buyer price—although the electricity market has its own flaws, in that the cost of units through the emissions trading scheme appears to be flowing through into significantly increased prices in the electricity market. 