It's a fairly significant question, and I would like an answer on this.
I think you actually start to make the system slightly less efficient, because your costs will essentially remain fixed. Now the costs aren't a huge number, but the costs will remain fixed and possibly even go up, because you're going to have to change from seven to six and then six to five.
Having said that, I would be interested to know what impact the credits will have by virtue of reducing your gross revenues by effectively one-seventh. At one level you're possibly turning a relatively efficient tax, which generates in the order of $30 billion, into a far less efficient tax.
I'd be interested in knowing what the answer is.