No it doesn't. That's not how reports like this work, for reasons which will be obvious if you think about it for a few minutes.
But, again, this just indicates you don't understand how reports like this are written and how they work. If the report relied on predicting the future it would obviously be useless.
I am saying you should (ideally) read the OBR's work on the impact of Brexit or at lest understand the basis on which the report was made and what exactly the conclusions are and what they mean. Obviously reports like this are almost guaranteed to be wrong in terms of what actually ends up happening because this is the work of economists not mystics. I would also recommend reading the opinions of other academic economists who will explain what it means, put all this into context and offer critiques of the report (which might very well be wrong of course). Twitter is an excellent place to do this sort of thing, The Spectator is the very worst. Brexiteer MPs about as useful as one would expect.
Obviously most people are not going to do that so the report gets reduced to a headline fact reported by the BBC and so on. And in this case the conclusion is that Brexit is broadly speaking twice as damaging to our economy as Covid mostly because Brexit has long-run effects on productivity and trade and Covid is more of an acute but (hopefully!) short term thing. The useful thing from an economics point of view is that people already understand the meaning and scale of Covid from the last 18 months, so in economic terms so knowing it's half as bad as Brexit allows them to understand the impact in of the latter in a meaningful way. Arguably this is better than the traditional method of converting the GDP deflator to a £ per month per household figure which is problematic for a number of reasons.
You patronise me on almost every point. You may well be right to do so - economics is your area, and I'm a shopkeeper. I have, however, and despite my modest station, read the OBR report, as it was the first thing I did after your first, curious, reply.
Nic posted a link to a BBC report (it's in the Guardian too) which seemed to state that the long-run effect of Brexit would be a reduction of some 4% of gdp against what would have been the case had we remained in the EU.
I posted a reply in which I assumed that 'long-run' meant 15 years, as in the earlier Treasury estimations, and simply pointed out that the situation in 15 years time would depend entirely upon developments both here and in the EU in the intervening period, and followed it up by saying that, unless the models accommodated a range of potential scenarios, such a prediction is impossible, and that a 'simple' prediction could only be based upon assumption of the status quo.
Having skimmed through the OBR report, I see the regular use of the word 'estimate', and much reference to the fact that the current (it actually is several months old) report 'updates' earlier reports, i.e takes into account developments that have taken place in the period in between two reports. Now you, having said twice that I don't understand these things, affirm that economists aren't indeed mystics, and can't see into the future, which I think is exactly what I had said in the first place.
Now either we're talking at cross purposes, or you are just trying to belittle me as a know-nothing Brexiteer.
If, in yesterday's budget, the Chancellor had set out a radical plan for supply-side reform, in which, for example, he had addressed the UK's laggard productivity and low cost/low value economy by creating substantial government support for corporate technological investment, revamped tertiary education to address the loss of technical colleges and apprenticeships, and put in place mid to long term support for workers to transition out of low and into high skill/value jobs, we might have potentially seen a closing of that 4% 'long-run' estimate. This is what I mean when I refer to (successive) government policy.
Your final point is lost on me, incidentally, as I don't think I've ever attempted to compare an economy to a household. I think you're making assumptions.