There is no probably about it. If you are going to model something this complex the best way to minimise bias in the model is to base it on the here and now. It is a bit like predicting the weather. The experts can give us a good picture for the next three days and confidently predict things will be generally warmer here in six months time, but only the Express can confidently predict the weather for the end of January right now.Just to make clear, are you saying that Goldman Sachs, IMF, The Bank Of England were probably working on the assumption that we had a referendum on the Thursday and then left the EU on the Friday?
If not and you mean that simply Article 50 was triggered then we would still have been in the Single Market with all the benefits and obligations that go with it right up until we left which surely everyone knew would be at least a year away and almost certainly more. And the reality is pretty much this although Article 50 wasn't triggered in June 2016 but March 2017. If the trigger of Article 50 was the catalyst for the predicted economic apocalypse then why did it not happen in March?
Sorry, but I don't buy this mea non culpa whichever way you mean.
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