https://fullfact.org/economy/how-accurate-have-brexit-foreca...
https://blogs.lse.ac.uk/europpblog/2019/03/22/uk-economy-sin...
"Relative to G7 countries, however, the UK has slipped from having the highest growth rate in the G7 before the vote, to the lowest now (OBR 2018)"
"Productivity has also suffered. "
"The sterling has depreciated and increased costs."
"Purchasing power has gone down."
"Finally, both inward and outward foreign direct investment (FDI) have dropped since the referendum."
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https://www.businessinsider.com/brexit-will-cost-uk-more-tha...
"Brexit will have soon cost the UK more than all its payments to the EU over the past 47 years put together"
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https://blogs.lse.ac.uk/brexit/2019/12/02/three-years-on-the...
"Three years on: the UK is paying a high economic price for its decision to leave the EU"
"While the UK started with a steeper growth trajectory, it has fallen behind other G7 countries since the referendum "
"Consumer Price Index (CPI) inflation rose dramatically from 0.4 percent in June 2016 to 3 percent in January 2018. "
"Real wages dropped from a pre-referendum annual growth rate of 1.1% to less than 0.1% after the referendum"
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And not sure what you mean by "changing goalposts". Surely you agree that the effects of Brexit will primarily come into effect after Brexit has happened?
Although the UK officially left in January of this year, we're still in the transition period, so none of the actual Brexit effects have happened yet, only anticipatory ones. So this is kinda like saying the fall off the cliff hasn't really been bad "so far" while still standing on top of said cliff.
And yet, the £ is at all time lows and the cost so far has already been $170 billion, with another $70 billion by the end of the year.
https://www.bloomberg.com/news/articles/2020-01-10/-170-bill...