It shows a comparison of successive UK GDP growth projections made by the Office for Budget Responsibility from the 2010 Budget onwards, both with each other and also with the actual UK GDP growth experienced to 2012. It is just one of many comparisons of economic projections with reality which could be shown to demonstrate how terrible we are at predicting the future, how we make ourselves forget this fact with detailed explanations of the special circumstances which made our predictions fail last time and how we need to find less useless ways to support decision making.

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