Much of the current narrative regarding the Brexit negotiations goes something like this: “Brexit is likely to damage the economy in the short term. Even its advocates accept that. They said that even if there is a good free trade deal with the EU we should expect the economy to take a few years to adjust, sacrificing perhaps two or three percent of GDP growth in the process. Now, they hope to get that back over the medium to longer term — Gerard Lyons talked during the Referendum campaign of a ‘Nike tick’ effect. But only a small set of economists, even amongst those that favoured Brexit, denied there would be short-term losses even if we do a good free trade deal with the EU. “Well, then, if even a deal leads to short-term losses, how much worse must it be going to be in the short-term if there is no deal? That surely must be very bad indeed! Perhaps it could be so bad that it would undermine the Conservatives’ reputation for macroeconomic management, ushering in a Corbyn go...