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Budget Responsibility and National Audit Bill [Lords]

In conversation with the Institute for Fiscal Studies, I asked various questions about growth and its calculations and it was pointed out to me that the IFS was in essence made up of micro-economists who were aggregating up to deliver predictions about Government fiscal outputs. I respect what the hon. Lady is saying, but it seems to me that she is basically saying that the OBR will be doing something very similar. It is very easy to make such predictions if we say, ““Assuming that everybody is still employed, that we have taxed them this and that they spend that, this will happen.”” What is more difficult is to model the impact of individual policies in a Budget on growth and hence on the public finances. The hon. Lady is giving us some reassurances, but I think the point of our amendment was to push her to say that this would become a priority for the OBR so that we could have a richer understanding of the growth scenarios in the future. I appreciate that some of that is done, but we want more.