Let me ask you quickly about the efficiencies defence. I believe the government is working on phasing that out.
I have a commerce background. There is, I think, an interesting tension between economies of scale, which can actually bring down unit price production and potentially the cost. I can appreciate that it can also lead to a situation in which the price mechanism can be controlled by a few companies that have that market power and market dominance.
How do you balance legitimate elements around economies of scale and the ability to disperse your cost of capital over a larger market share so that the unit price actually can come down, versus an efficiencies defence that can also be monopolistic? Where's that balance? Can you try to explain that to this committee?
Would you agree that there is some element in economies of scale in the idea that some concentration can be good, but can go too far the other way as well?