Actually, we build a model around labour supply, so we look at working-age population, we look at employment rates, and we look at hours. And we provide a lot of transparency in those calculations. We do sensitivity analysis around employment rates and around immigration rates in our studies, and you can see if we make fundamental changes to immigration what the impact on our fiscal unsustainability problem is. It has an impact, sir, but it's very difficult to offset through immigration policy any substantial proportion of our decline in labour supply growth.
On April 12th, 2010. See this statement in context.